Human rights are - by definition - reserved for humans. Since saddam is not a human but a beast, he necessarily does not, and cannot, have these rights and therefore is not covered by them. Thus the "human rights watch" has no standing to squeal on the topic. PETA might, though.
"Since saddam is not a human but a beast.."
This is the mistake that we constantly make. Saddam is not a beast but very much an evil human being. Beasts follow their instincts and cannot be held responsible for their actions - Saddam knowingly acted the way he did and must therefore be held responsible. My dog is a beast and he feels offended for comparing him with Saddam.