Cuz news flash on all accounts, he isn't. Even if we were to factor in every single one of Chloe's actions, regardless of context, Felix's actions still completely surpass hers.

Felix treid to ruin Adrien's relationships by pretending to be him, attempted to sexually assault Ladybug, willingly prevented the heroes from defeating the punisher trio(Lady Wifi, Princess Fragrance, and Reflekta) in order to attempted to work with Hawkmoth. And that's just his debut!

Fast forwarding a season we have him willingly stealing and traded nearly all the miraculous to Gabriel, alongside Adrien's amok, express zero remorse or guilt over it and then committed actual GENOCIDE! AN ACT HE ENJOYED DOING!

"He uh undid it in the end! So that means it no longer counts as a genocide, plus it was a heat of the moment thing"

Felix only undid it because he was unable to bring back Marinette for Adrien & Kagami. Meaning had he been able to bring Marinette back, He absolutely wouldn't have undone anything! Especially because he made it clear that he had no intentions of doing so!

Him undoing it doesn't excuse or undo the fact that he did it in the first place. That's like saying if Person A were to hold Person B at gunpoint and then stop an hour later it would be completely fine and Person B shouldn't press charges because Person A stopped.

It was not in fact a heat of a moment thing, the episode makes it absolutely clear that Felix thought out his plan in advance before doing it. The episode literally shows that Felx made Red moon during the night, right before showing Felix use her to kidnapped Adrien during sunset indicating that his genocide was planned out at the absolute minimum the day before the diamond dance.

"Felix fights for the oppressed and for the freedom and safety of Sentimonsters!"

Felix willingly traded Adrien's amok to his abuser, alongside sending sixteen of the kwami to slavery for his own personal gain. Hell his whole genocide plan, him only taking any interest in Kagami after learning she's a sentimonster, and his last minute inclusion of Marinette makes it clear he doesn't give a damn about humanity.

Even if we were to ignore the fact that he willingly and knowingly handed over Adrien's control caller to Gabriel, to say that he fought for sentimonster safety and freedom would be completely bullshit due to him making a sentimonster in Representation for the sole purpose of being a projector before proceeding to murder them the moment their purpose was done.

"W-Well Felix um try to make up for his past wrongdoings to stop Gabriel"

Except he didn't, all he did was create a play to get Marinette to sympathize with him in order to excuse/justify himself of all his past crimes, and hint at Gabriel's identity so vaguely that Marinette didn't even realize that Felix even told her. Hell he did jack shit during the final battle, This is not even mentioning the fact that the only reason he even did the play in the first place was because Gabriel & Tomoe were interfering with the romance he was trying to start up with Kagami.