That HIV causes AIDS is almost certainly true came from overwhelming evidence from multiple angles, not from some sort of "scientific proof". Realistically the

That HIV causes AIDS is almost certainly true came from overwhelming evidence from multiple angles, not from some sort of "scientific proof". Realistically there is no such thing as scientific proof- just "enough evidence that making the alternative case requires extraordinary evidence and predictive ability". What I don't like is that Kennedy is trying to place a pseudoscientific veneer over a conspiracy theory idea, sort of "oh hey it looks like the science is still up in the air". If somebody were to convincingly demonstrate that HIV didn't cause AIDS, it would rewrite large sections of many textbooks.