This all depends.
Security was well within its rights to go up to the gentleman and say, "Excuse me sir, but could you remove that game from your waistband and be sure to keep it out in the open? Yes, we know you weren't trying to steal anything, but it's store policy..."
If they started that way, then they should be able to escalate as far as they need to. If someone gives you attitude, you invite him back to the station. If he doesn't come along willingly, you put a hand on his shoulder and lead him. If he struggles, you tackle him. If he pulls a gun, you shoot him... escalation happens until the situation is under control, always staying one and only one step ahead of the troublemaker. That's the only way to do it... but it starts with a polite, "Excuse me, sir, but you aren't allowed to do that." Give the poor guy a chance to cooperate and explain.
On the other hand, if they just came out of left field and shoved his face into the ground, then that's uncalled for. Hopefully, the same cameras that let them see him will prove what happened one way or the other.
RvLeshrac said:
So then you're going to be completely calm when you're being arrested without just cause, right? We don't live in a police state, yet. Last I checked, it is your right and responsibility to determine exactly why you're being arrested before you allow the police to handcuff you.
When a police officer is talking to me, I am absolutely going to be completely calm. And consumately polite. You have the right to know what you're being charged with, sure, but the police officers have the right to defend themselves too... they're nervous, and rightly so. For all they know, you're gonna pull out a gun and shoot them. If you challenge their authority with physical force, they are going to, HAVE to, respond in kind.
IF a police officer acts improperly and doesn't read you your rights, your best bet is to cooperate, keep your mouth shut, and get yourself the cheapest lawyer you can. Hell, go with the free lawyer they provide you. You know why? Because lawyers put careless cops to shame every day. That's just about the first thing they learn to do.
However, when was the last time that physical force won out against the law of the land, and I mean actually won rather than let someone escape to go into hiding for the rest of their life? Unless you're ready to stage a revolution, physical resistance is NEVER your friend.