I don’t count Looney Tunes. Those cartoons are very cartoonish. I don’t think it is easily confused with real people or animals. Since the entire scene is unreal, so is the violence. A talking bunny rabbit already is obviously not something to be believed. Video games often are figures or avatars of people and the drawing is quite realistic. When I look at cartoons of yesteryear they were cute, when I look at them now almost everyone appears to be evil, it’s hard to tell who is the bad guys and who are good.
I guess maybe a child might try to mimic the Road Runner or Fred Flinstone and try something dangerous, but I think it is extremely unlikely. Probably violence born from video games is unlikely too, but I bet more likely than Bugs Bunny.
I do think many kids and even adults are desensitized to violence. I don’t like to watch violence, especially rapes or torture. Any suffering is very difficult for me to observe, but a lot of people have no problem watching it. My husband doesn’t, he says to me, “it isn’t real.”