The question remains: why the advent of AIDS so suddenly toward the end of the 20th Century?
Evolution.
Mutation.
Karma?
Unfortunatley, the African monkey theory remains a spurious monkey theory without the explanation of what suddenly happened with the monkeys that had never happened before, because of the need to make some sense of that for the supposition of dangerous contagion to hold water.
What?
You mean the mutation of a primate virus after being contracted by a human by eating bush meat?
That's pretty out there, isn't it?
(That's a rolleyes comment.)