(1) Hitler was no biologist. He fancied himself an architect more than any kind of scientist, and we don't condemn architecture, do we? (Stalin studied for the priesthood, for whatever that proves, which isn't much.)
(2) Hitler was, without doubt, lying scum. If he wanted a pretext for some action of his, he would say anything: his people need "living room;" they lost WWI because Germany was "stabbed in the back;" his national socialism was the wave of the future; the jews were destroying Germany, etc., etc. With all these lies and delusions, why does anyone take him seriously if he sometimes made some remarks about evolution?
(3) Jim Jones was most definitely a creationist. So what?
(4) I've jokingly blamed all horrors of the 20th Century on Thomas Edison. Everything followed his satanic electric light, after all. Hitler used electric lights, etc., etc. So Edison is as much to blame as Darwin, right? Post hoc, propter hoc.
(5) Finally (I could go on and on) why wasn't Darwin himself a mass murderer? Surely, if anyone were "tainted" with Darwinism, it was the man himself.