Дело №0001. PSYCHO-Mafia.

I'll ask again, if the Knight kills in the first night, so what?

The point is that the only difference between a Knight and a Commissioner in this case is the formal goal of winning. That's it. And in terms of effectiveness, the Commissioner is worse.
I'm very afraid that if we get rid of the Knight-Tox now, the Commissioner will make a stupid move in the second night, and we'll end up with a 3 vs. 3 game, which means we have no chance.