I didn't say that it wasn't because more people are diagnosed, just that I don't think it is the ONLY reason for an increase in cases. A diagnosis does not create the symptoms, the symptoms create the diagnosis.
If we just assume that it because of more increases in diagnosis and awareness, then we rule out other contributory factors that we might possibly be able to do something about. I think some people don't realise when they say this that they are providing a convenient excuse not to research autism and the increase in cases because it is "just more awareness". I agree that older generations have been under diagnosed like myself, but we can't rule out environmental factors such as plastics and other substances known to cause problems. We do need to be open any possibility without being biased towards a particular opinion.
I personally would rather my son had autism than would be dead, so I was happy to take the risk of vaccines, but I'm not going to accept there are no other causes for it that exist and it is just more people being diagnosed. Thats not a cause itself, is just a trend in diagnosis rates. There is very limited research really, considering the impact and prevalence of ASD.