>>2
It is too much of a coincidence that the only educated and mobile boy lovers in Germany would suddenly come together and by chance generate a homoerotic political ideal. Einstein is probably the only famous scientist to have married his cousin and occasionally people do marry their cousins so it's not much of a coincidence.
Maybe there is a slight chance that it is all a coincidence and communism is not the anal fantasy of a bunch of the 19th century's equivalent of NAMBLA, but I'm not going to take that risk. There is also the fact that by definition communism is pedophilic homosexuality that needs to be considerred.