Under the Bush administration and the Obama administration, extremely severe, inhumane torture has taken place at the Guantanamo Bay detention camp (Gitmo) in Cuba. This torture has taken place in the form of waterboarding, among other things. Terrorists are indeed evil, disgusting human beings, but by torturing them, we are sinking to their level.
Plus, not everyone detained in Gitmo is a terrorist, or even guilty of any crimes. Look up Shaker Aamer, Ahmed Bel Bacha, and/or Bradley Manning.