There's some bad ideas I've seen out there. And then there's the downright idiotic ones.
This would definately fall into the latter.
The article informs us that a school district in Texas is preparing kids to fight off armed classroom invaders by swarming him. After all, they have the advantage of numbers. There's no way they could lose. And who cares if a few lives are lost, just as long as those Texans teach the intruder not to fuck with Texans.
Perhaps this is the prevailing wisdom of Texans. As long as we show the bastards who's boss, it doesn't matter how many people die. Who cares if 2,000 American soldiers die just as long as we show Iraq not to fuck with US.