Surely Mill and the like can be seen as having some influence on liberalism? I certainly don't think our current society is so bad as to be comparable to the Nazis or USSR.

I'm also a little unhappy with your characterisation of both Nietzsche and Alexander. For one, Nietzsche's link to the Nazis was more due to his proto-nazi sister and brother in law who edited and published The Will to Power, using his name and extracts of his notes to support their political ideology. I also think Alexander wasn't so bad for his time. True, imperialism isn't a good thing, but as I've been told for the short span of his rule Alexander was a fairly good king who allowed his subjects to follow their own customs and treated them fairly regardless of nationality. I may be mistaken and there might be a bit too much hagiography in the history of Alexander though.