Police arrest people that commit crimes, or commit criminal acts-- the innocence part is for court. When the police office catches the person burglarizing someones house, or robbing someone or shooting some one or beating someone up, the officer arrests that person, what happens in court is something totally different.
I wonder what you would do if someone hits you, or spits on you or shoots at you, your heart is pumping and then you finally catch that person and finally get him cuffed, most of the time it is over-- MOST of the time, but they are human also and still pumping so yes sometimes it happens and they get carried away. AGAIN it was determined by the the arrestee. When they flee the police in the auto, and lead them on a high speed chase, it was the CRIMINAL that causes the chase and puts everyone in danger-- people on the street, and the officers chasing. When things like that happen, everyone is running away, EXCEPT the police officer runs TOWARDS the danger. Shots fired, everyone running away, the officer (with a spouse and kids at home) runs towards it. More policeman in the USA have been killed since 2001 then soldiers in Afghanistan. I know of a policeman, the prisoner is handcuffed and walking his prisoner into the lock-up, prisoner leans forward and bites off officers finger and chews it an swallows it. Man is handcuffed and kicks the police, of spits on him, bites him. The confrontation is ALWAYS determined by the citizen. Yes, the Police are human, and sometimes the citizens actions will cause a more violent action REaction by the officer, by always in response to the citizens actions. The Police do hundreds of citizen contacts a day, and how many turn violent? VERY VERY few. So are all computer programmers crazy killers because of McAfee, or Hans Reiser actions? So do you judge all by the actions of a very few? I can show you lots of killers that have been arrested and convicted and sent away then get out and do it again multiple times, where is your outcry there.
The police to NOT torture people in the USA, no matter what you want to believe. I have seen tens of thousands of arrests by thousands of officers, and never any torture. Need to stop believing what you see in the movies and on TV. Almost every policeman it is just a job they do and then go home, they are just like real people. Except their lives are on the line every minute they are out making contact with the citizens. More police are hurt in day to day confrontations then citizens.