Yes Cool, you are right, of course! In my comment, however, I was focusing specifically on comparing Trump with Hitler, especially in light of the question of how evil Trump will have to get before it will be truly fair to directly compare him with that failed art student with a ridiculously short moustache named Adolf!
In general, the study of evil is called “ponerology” and evil acts committed by political actors fall under the label of “political ponerology.” One big problem in determining just how evil a given political figure is, however, is the problem of “numbers” vs. “attention to detail.” Some despotic rulers are very good at murdering millions of their own citizens over a short period of time (such as Pol Pot of the Kmer Rouge), and then you have individuals who specialise in carrying out particularly grisly murders (such as the fictional character Hannibal Lecter). The Nazis seem to have excelled at both, as they caused the deaths of a large number of people both directly and indirectly, but the Nazis doctors were equally capable of carrying out insidious experiments on their hapless victims. It remains to be seen just how far the Trump regime will go in that direction.
Naturally, as you mentioned above, the United States as a whole has become a “global killing machine” without equal since 1945, and it had lots of “practice” long before that!