The world isn't a safe place, and it doesn't get any safer when you turn 18; there's no point in keeping the kids home as if that protection is anything more than a delay of the inevitable. It's important to teach the next generation that the government is not their friend, and the way you do that is by showing them that the flag they're forced to pledge their allegiance to every day in school is the same one that will attack them for suggesting that there be liberty and justice for all. The kids out on the streets today will be the ones leading their peers in the battles they'll be forced to fight against the government as adults.