talking about superheroes..
Very few American superheroes actually do kill. even Power Rangers now don't kill their villains. in fact, Power Rangers has become a stupid, CGI-infested, watered-down piece of crap, which disgraces each Japanese Super Sentai season it is supposedly "based" on.
The reason why Americans are so afraid of killing in their shows is because
people will complain. Censorship is very terok over there...Even blows to the head, kicks to the chest, grabbing the neck is not allowed to be shown on kids TV. Heck, even bullets get edited into lasers damn it! And they throw in hundreds of slow-motion, CGI lasers and explosions everytime there are fights, which makes everything look REALLY REALLY bad.
Here are some examples:
Check this out, none of the lasers actually hit!


And how about this! They are standing right in front of each other and none of their lasers actually hit each other!


Compare the above two with the one below, which is from Japan and was edited out in its American counterpart..Bullets + Accuracy in shooting


For more such edits you can check out: www.sodders.net