Look, Hitler and Goebbels both directly ordered the deaths of civilians. It's intellectually dishonest to say Charlie Kirk was doing anything equivalent. There's a difference between hateful and violent rhetoric generally and actively managing and overseeing death camps.
I agree theres a limit, but I would put it at when you're rhetoric becomes action. Both Hitler and Goebbels took active actions that lead to peoples deaths. Actions that were more than simple rhetoric in the public sphere.
I mean, perhaps you're right, but I bet if we took a poll here we'd get a majority of people sounding off that it was a good thing he was murdered.
But maybe you're right and everyone agrees it was bad he was murdered. I wouldn't bet on it though.