After years of detention and separation from the battle field and terrorist networks, many Guantanamo detainees have no more value to US intelligence gathering efforts and national security, and so this is not a reason to continue their detention. Moreover, there are tens of thousands of anti-American terrorists around the world. Releasing a handful of the 250 detainees that are actually terrorists but that can't be tried in the US would be a drop in the bucket for terrorism and the war on terror.