I don't doubt that Hitler, Stalin, etc. 'borrowed' Darwin's ideas. Let's also remember that Islam 'borrows' the concepts of 6-Day Creation, Adam & Eve, Noah's Flood, etc. from Judeo-Christian thought (i.e. the central tenets of Creationism). Kind of strange that 'objective' people see one link but not the other.
In many cirles Islam is explicitly regarded as (at best) a heresy of Christianity and/or Judaism. (See for example Hillaire Belloc's The Great Heresies.)
But totalitarian dictatorships are not a "heresy" on biology...
Cheers!