Arguments make sense if agents have freedom of thought. When you deny freewill, you end up destroying the concept of rationality and you reduce everything to subjectivity and therefore absurdity. It's absolutely ludicrous to deny what's necessary to make sense of rationality, and then expect a rational discussion. I find it quite laughable to be honest while at the same time sad. Whether this denial comes from theists such as Calvinists whom I have dealt with a lot or atheists who have to ultimately deny freewill as there is no place for it in a world where time, chance and matter is all there is! :]