Apparently I did manage to start an entire "who can be the most retard" thread. Yeah, I'll definitely not gonna go through it, because there's way too much to even read, and some of it is just too retarded.
For instance: "there's no way the crematoriums they used to burn the bodies could be X times more effective than modern crematoriums!!!".
Once again, just plain ol' common sense would tell you that today's crematoriums are designed to just burn one body at a time. But what modern large scale manufacturing taught us, is that when you increase the production by A LOT, you suddenly become incredibly more efficient, then when you build something one item at a time.