Again - once you condone any sort of torture/beating, it can be used in a wide variety of places.
The minute it's okay for a man to be tortured in US custody, it opens up a lot of abuse potential in the future.
You make this acceptable and in 2 years it'll be acceptable to beat political dissidents, and in 2 more you give police power to beat pedestrians based on their own judgment.
New iraq = same as old Iraq. Only now, it's happening in US prisons there

Source: BBC
The brother of the Iraqi journalist who threw his shoes at US President George W Bush has said that the reporter has been beaten in custody.
Muntadar al-Zaidi has suffered a broken hand, broken ribs and internal bleeding, as well as an eye injury, his older brother, Dargham, told the BBC.
Meanwhile, offers to buy the shoes are being made around the Arab world, reports say.
The Iraqi authorities have said the 28-year-old will be prosecuted under Iraqi law, although it is not yet clear what the charges might be.
Iraqi lawyers have speculated that he could face charges of insulting a foreign leader and the Iraqi Prime Minister, Nouri al Maliki, who was standing next to President Bush during the incident. The offence carries a maximum penalty of two years in jail.