Why do police always attack protesters?

Well, it's a bit complicated. If people are protesting something that the government wants protested, then they are allowed to continue. But if the protesters are embarrassing to the government, for example protesting police brutality in Democrat controlled and corrupt Baltimore, then they have to be put down by any means necessary.

So the police need to incite the protesters into doing something illegal, or simply plant fake protesters and have them set some fires, then the police have cover to attack whichever protesters they want.

That's because you're an idiot. If you stand there with a sign and chant a few slogans, you will be left alone. If you start throwing rocks, turning over cars, starting fires...you are no longer protesting, you are rioting. And at that point the police should light your stupid @$$ up.

police only attack protesters when it is out of control thats why they call them crowd control

Protection.

I speculate but it may be because they are throwing bricks at the police and they gets angry. There is a 50 caliber solution for the brick throwers.

They don't, and in Baltimore they don't even attack rioters

FAIL

They don't.

It wasn't your car on fire, I take it.

Because they just don't like anything about them whatsoever.

they know conservatives got their back...