Now I present to you the reason it is called torture and the reason it is prohibited by the Geneva Convention and the US Army Field Manual.
From Wikipedia :
Waterboarding is a form of water torture in which water is poured over a cloth covering the face and breathing passages of an immobilized captive, causing the individual to experience the sensation of drowning. Waterboarding can cause extreme pain, dry drowning, damage to lungs, brain damage from oxygen deprivation, other physical injuries including broken bones due to struggling against restraints, lasting psychological damage, and death. Adverse physical consequences can manifest themselves months after the event, while psychological effects can last for years.
Dear Mr. Trump, if you still believe that it is okay to treat another human being that way, you should try it yourself sometime. Oh, and ask Sean Hannity to fulfill his promise to be waterboarded !
ED
