Before building too much on that quote it would be as well to be sure that he actually said it. He may well for that matter - it's been a common enough theory about AIDS to suggest that it was the result of a government research project that went wrong. Nothing intrinsically impossible about that either - it just doesn't seem to square with the evidence.

As for the suggestion that there are people in high places who would have few qualms about genocide, sadly enough that does not seem at all impossible. After all willingness to carry out genocide is implied in the readiness to use H-bombs.