It needs to be said, yeah. Because a lot, and I do mean a lot of Western Leftists use "war crime" as "it makes me feel bad personally."
The conventions on war and what constitutes a "war crime" is set up specifically to keep evil shitheads like Hegseth, Hamas, the IRGC, Putin, and others from having an incentive to basically go, "Ah ha, I'll do this One Simple Trick to get myself a temporary battlefield advantage!"
And that One Simple Trick can be:
Dress up my soldiers in the enemy's uniforms so the enemy will think I'm on their side before we start shooting them.
Dress up my soldiers in civilian clothing so that the enemy will think that we're not soldiers before we start shooting them.
Dress up my vehicles in civilian colors so that the enemy will think that it's not military before we start shooting them.
Dress up my soldiers to look like doctors so that the enemy will think that we're not a threat before we start shooting them.
Hide my weapons, soldiers, and armored vehicles in civilian areas so that the enemy will risk killing lots of civilians and we can shoot at them with impunity.
Force civilians to stand around my soldiers so that if they get shot at, it's more likely that one of the civilians gets hurt, so I can shoot with impunity.
The problem is, as soon as someone starts doing that, the soldiers on the other side can and will say "Fuck it, if they're dressing their soldiers as civilians, then we shoot anyone who looks like a civilian, because we can't tell if they're a soldier or not."
Which means that the One Simple Trick has now made it open season on civilians, because no commander worth his salt is going to risk his men going up against a risk like that.
We've been there before, we've seen the damage that does, had the mass graves that ensue, and basically went, "Okay, this list of One Simple Tricks is Off The List Of Acceptable War Tactics because the consequences just makes everything worse. And if you do them and the other guy shoots anyway, you're at fault of the war crime, not the person doing the shooting."
The list is extensive, but a lot of people just ignore why it's set up that way and use "war crime" as shorthand for "I think that side should just sit there and let themselves be attacked, and the fact that they didn't and shot back makes me upset at them."