I have been giving this some thought for a while:
Winston Churchill is given credit for saying that when we are young we are all liberals and when we get older we become conservatives. To be otherwise would mean that we have no heart when we are young and no brain when we get old.
I think we can all relate to being children and wondering why life is not fair or why everyone can't be helped by the biggest thing that we knew at that age; government. As we got older we learned about life and people. We learned about government and the abuse that it can be responsible for. We learned about people in government and how terrible their motivations could be. In a word, we become more conservative based on new knowledge and wisdom. So,
Becoming conservative in thought is an evolutionary process.
We hear of liberals like the late Ron Silver, Dennis Miller, David Mamet becoming conservative and moderates like Ronald Reagan becoming more conservative as they age. Aging gives us new knowledge and insight. Has anyone heard of any conservative becoming a liberal as they grow older? I can't think of one. Take note, I am not talking about democrats or republicans. That is a party affiliation. I am talking about philosophy or way of life.
So that is it, becoming conservative is an evolutionary process and some people never evolve as it were.