The road to hell is paved with good intentions. That's why it's so important to have honor and ethics; there should be lines that you will not cross, even if "the ends justify the means" (which I think is a load of crock).
How you act shapes who you are and how you think. Even if you're sure that the horrible atrocities you're commiting are for a good cause, eventually you will view those atrocities as okay or fine to do by themselves.
In essence: Mr. T is not a good person, even if he has good intentions. He knows that he doing evil things, and he does them anyway.