"This guy should have just walked outside to talk to the cops. HE is the one responsible for forcing the cops to subject children to violence."
I disagree. Did you read the article? According to a witness, the cop was poking him in the chest. His response? He said, "you don't have to do that." Then they shoved him into the lap of another patron, and tased him in front of a group of children. The cops started the confrontation, and then escalated it to violence.
A cop has no right to lay hands on a citizen if he's not making an arrest. You don't get to provoke someone by poking him in the chest. Either arrest the guy for suspicion of theft, or leave him the hell alone.
"Either arrest the guy for suspicion of theft, or leave him the hell alone."
I think that's what they did. They arrested him. Besides, cops just don't shove people down in front of a crowd at Chuckie Cheese's. If the guy thought the cops did wrong, he should have gone along with them and taken the matter up later. By refusing to walk outside, he effectively resisted arrest.