So, it comes down to comforting our children by saying "It's okay, don't be scared, the bad guys are dead," huh? Not only do I find that distasteful, but it's ridiculously unrealistic. That works in movies, or video game, or books... at the end, the credits roll or you close the back cover. Real life keeps moving on, and there's a whole bunch of people who probably told their kids that the day the towers fell... it's okay, some of those bad Americans are dead. And just as we retaliated, they will retaliate. People (even "bad" people, assuming I momentarily accept that term) getting killed should not be a comforting thought... not just because I'm on some moral idealistic high horse... but because corpses beget corpses.
But, you know, maybe if we just teach our kids to kill the bad guys, it'll turn out okay.