Spoken like a true fascist. The popo doesn't get to decide whether you go to jail or not, they only have the right to detain under limited amount of time.
Not only that, resisting arrest is not the same as fighting back. Notice that the man was resisting slightly when he turned back but he made no attempt to fight the popo. Notice also when the popo slammed him to the car (which I think still justified though a bit excessive) he wasn't resisting or fighting back (as clearly shown by his hand) any longer.
But of course, the popo being the popo, slammed him to the road, punched him repeatedly and unleashed the dog on him.
Of course the popo wouldn't do this to any rich people less they get their ass handed in criminal court.
Speaking of Japan, the super majority of police officers there don't do the kind of shits seen here. That's why they're highly respected by the community. But then again, you don't have right wing loons running around with assault rifle there.