Not sure why you are downvoted, for presenting what amounts to the leading theory of free will. ( Compatibilism, the view that free will is compatible with determinism is the most popular theory of free will among philosophers.[1])
Politics. Any question that has remotely been associated with different ideologies, religions or any other polarizing groups division is bound to provoke this kind of reaction.
Free will is associated with religion, so non-religious people tend to oppose to the idea.
Actually I believe that religion is in the origin of the no free will conception.
Nature vs nurture is another of such debates. I'd add a few more, but enough of making friends for today :-)