If you repeat a lie often enough it will end as a truth and as a normal state of things. It would be incorporated into the culture's mental or cognitive schemes and as such it feels natural. It becomes part of the collective "archetype". Did not a Nazi already said this?
Well, plain logic...
I read in some article that we have material from pigs too. 1) Is that possible? Can pigs and monkeys breed? 2) Is there any possibility "someone" in a far away past crossbreed-ed genetic material of both apes and pigs? Are we a hybrid?