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Sarevok goes to Candlekeep twice, but it's only the second time that he leaves a trail of bodies behind. Each times he pretends to be a traveling monk and goes by the name of Koveras. The first time is only for research on Alaundo's prophecies, but the second time is to orchestrate Rieltar's death. His plan has two possible paths: either convince Gorion's ward to kill Rieltar themselves, or have a group of doppelgangers kill him, disguised as Charname and their party. At this point, Sarevok has been hunting them for a while, placed the highest bounty he could on their head and they still escape him. Candlekeep is supposed to be the final trap, the one that works. It's straightforward and shouldn't require a massacre. Six people, at most, so the doppelgangers can wear a face until Charname and their party get there.

Instead, when you get to the catacombs, you see they've been used as a body dump:

It's enough bodies to have attracted a bunch of ghasts too.

Sarevok used doppelgangers before, but they had strategic purpose: kill other mercantile group leaders, take their place and ruin them. There's no sense to the massacre of Candlekeep, except Charname.

It's their home, where they grew up, and regardless of how the player decide their ward feels about it, it's a decent home, with people who care about the ward. It's shown through the prologue with characters who have known them throughout their lives and are all part of a familiar landscape. The prologue is where the situation of Charname is introduced, and it's shown again in chapter six (I left the whole dialogue if you want to read because I think it's funny, but it's not all relevant):

Theodon: [...] Took the cloak right off his back, you did, and made yourself just the cutest little... [...] Theodon: Nobody was sure what to do, and then Khelben mutters some words and catches you by the scruff of the neck with some sort of spectral hand. He hauls you out and drops you right in front of him, grabbing his filthy cape in the process. Everyone was scared, they were. Weren't they, Jessup? Jessup: Sure enough. Scared witless. [...] Theodon: Oh certainly, little one. Stop by any old time though. I've got some paintings of you as a youngster I'm sure your little friends would love to see. Remember the one of Valdis (Charname) on the bearskin rug, Jessup? Jessup: Surely do. In the buff as usual. Theodon: Cute as a bug you were. Go play with your friends now. Go on.

It shows Charname had a good childhood. No conventional family, but a group of people who cherish them, fear for them, remember them fondly and keep mementos of them. Charname is loved, Candlekeep is a place of safety and affection for them.

That's what Sarevok destroys when he lets the doppelganger run free in Candlekeep.

Sarevok and Charname's childhoods are polar opposites, as well as their current relationship with their former caretaker. That is Sarevok's childhood memory:

"I had a dream this night. My mother was talking to me, but as she did her face became bloated and discolored. Her voice became weaker as she spoke to me, telling me to save her from Rieltar. I could see the garrote cutting into her neck, but I did nothing. It was only a dream."

And that's his current relationship with his foster father:

"He [Rieltar] mentioned mother in our conversation: how I wasn't to be as unfaithful to him as she had. He made it clear I would suffer her fate if I was."

Sarevok made two trips to Canlekeep, and during the first one, Charname was still there, living a carefree life, a life Sarevok could witness. He decides to go to Candlekeep during the month of Nightal (December) 1365. It's not clear when he leaves after that decision is made, but he only leaves Candlekeep at the end of Tarsakh (April) of the next year. He could've been there for a maximum of four months, during which he realizes that one of his Bhaalspawn sibling is there and their lives could not be more different.

In a previous post, I highlighted that Sarevok's plans stop being purely strategic when it comes to revenge, like the destruction of the Iron Throne branch on the Sword Coast, which was Rieltar's project. Sarevok applies the same 'scorched earth' tactics to Candlekeep, not because he needs to, but because he wants to destroy Charname's childhood home, destroy the idea of safety that comes with it.

"Unfortunately, there must be more of the creatures disguised as others I know and trust."

It's important to note that Sarevok makes Candlekeep the place of Rieltar's death. He gets rid of the major source of his own childhood misery in the same place that saw Charname live a happy one. He turns that place into a nightmare for Charname and liberation for him. He 'steals' Candlekeep from Charname. They got the spoils first, now it's his turn.

I don't believe Sarevok is consciously including any of this in his enmity with Charname, but there's a stark difference between his usual schemes and what goes on in Candlekeep. He's never hesitant to kill, his ultimate plan is a bloodbath of a war, but should anyone notice the doppelganger issue in Candlekeep, his plans could fail. He's more reckless here, just like he's more reckless when taking revenge against Rieltar.

One other sign that he's slipping is this conversation you can have with 'Koveras'.

"You were there. You saw it all. A woman, an armored figure, two ogres wielding clubs, and two archers. But Gorion's petty magic was of little use against them, was it not? And you, you fled with your tail between your legs, hiding amidst the trees until dawn broke. And now it comes full circle, doesn't it? The Iron Throne so close you can almost touch them and wreak your revenge for that night."

What Charname asks isn't much of a trick question. Everyone is aware of Gorion's death at that point, Sarevok could get away by saying he assumed 'evil befell him' since he died. He's proved he's a good liar, he could spin something. Instead he goes on a rant worth a confession (also he lists Tamoko before he lists himself, love to see it). Not to mention he's trying to get you to trust him. This slipup and the reckless brutality of his plan show he's not indifferent to Gorion or Candlekeep, the same way he's not indiferent to Rieltar.

Unlike Rieltar though, the revenge Sarevok is taking against Charname is more complex because it's rooted in envy. Envy for the childhood they had in spite of being a Bhaalspawn, envy for the parent too. Sarevok kills Gorion and try to have Charname kill his own foster father. If he can't get them to, he uses a doppelganger who wears their face. It's 'going full circle' in every way.