I agree the police officer's actions were awful, but what does this have to do with homeschooling, per se?
This could have happened to any group on any day. The cop didn't go after them because they were a homeschooling group -- he did it because he is a control-freak jerk.
It does have something to do with homeschooling. Schools now have "zero tolerance" rules (otherwise known as zero common sense) which prohibit not just weapons, but butter knives, pictures of guns, even pointed fingers. Homeschooled kids are not indoctrinated in this. The teacher and police sent them a message that they better get with the program.