Because society sends the message that it's okay to bring them up on charges. What a difference a generation makes. In my youth, police were the law, teachers were obeyed even if you didn't agree with them, and parents were respected, or else. I'll sue you. I'm sick of it.
Some people argue that things are more complicated today.
The issues aren't black and white. There's a lot of gray. The only thing that isn't clear really for those people is their set of values. It is possible to deal with people with compassion and to allow leeway when called for without compromising justice. But to do that, one must be clear that right is right and wrong is wrong.