I have seen a lot of messages over the years from people who claim that it is a no-no to start a sentence with "But." On the other hand, I have never encountered a case where somebody complains about starting a sentence with "However."
Since, in very many, if not most sentences, But and However are equivalent words, synonyms, no less, so why is one acceptable and not the other?
I ask the question because I often have need to start a sentence with But to make the flow of the language smoother and easier.
As an example:
1. The people around here are crazy. But, most people in this town are crazy.
2. The people around here are crazy. However, most people in this town are crazy.
This is a serious question, and I would appreciate an answer.