I've read an interview of a war correspondent that after witnessing war can no longer enjoy war entertainment, as it is disgusting to him.
I think hostility towards an attitude that takes inflicting death lightly, for entertainment is justified.
I think so.
The same factors that make machines cool remain intact regardless of the application. Furthermore, there's much more kinetic energy involved when you're trying to take something apart quickly than when you're trying to carefully build it, and more still when someone else is trying to keep the thing intact. Is a controlled demolition cool? If not, why do people watch?
Nobody is arguing in favor of violence. The comments here are recognizing some of the reasons why war seems cool, especially to the young and especially to men.