At least the villains of Final Fight disposed of their defeated enemies in a suitably cartoonish fashion.
"Please, God, I swear this will be the last time I check the Casual Encounters section."
This wouldn't necessarily have been traumatizing on its own. It's no worse than a Bugs Bunny cartoon. But there's something about the way Haggar tried to blow out that bomb's fuse. There's so much fear and panic in his face -- you know he wants to live, and it is only your miserly quarter-guarding that is dooming him.
"Mayor Haggar is survived by his daughter and his mustache."
Then there's the Punisher arcade game, where the Punisher's sidekick frantically attempts to resuscitate his boss' battered body. It does not appear to be working.