I didn't say unfounded, I said it's not the end of the subject- big difference. I've known a couple people who cling to "Survival of the fittest" like a baby lemur, and that's not healthy either. (Excuse me for a moment while I awww over the thought of baby lemurs. Awwwww. Okay, I'm back.)

Mitosis of cells can be proven through observation/deduction, I think, so can the people with AIDS, assuming enough money for a worldwide blood test. Neanderthals and Cro Magnon link theories can't be proven as of yet, since we can't observe them. (Though with DNA and carbon dating we can make really educated guesses.) I think you're confusing "theory" with "hypothesis."

Evolution: Theory (a supposition or a system of ideas intended to explain something, esp. one based on general principles independent of the thing to be explained)

AIDS population: Hypothesis. (a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation)