Cancer and Alzheimer's are on the rise because life expectancy is increasing.
Nope. That only explains a portion of the increase.
Got a convincing and well-sourced statistical argument on that one?
Yes. Do you for your declaration?
Because we are better at diagnosing them then years ago. It does not mean that there are more cases of "cancer, Alzheimer's, autism, etc.". People diagnosed with Asperger syndrome would be called quirky, or plainly weird twenty years ago.
Nope. Doesn't explain it away. Real rates are rising.