Determinists often attempt to associate determinism with science. The idea is that determinism is scientific and free will is not, because the laws of physics as we currently understand them are deterministic.
I think one fact this overlooks is that science requires the concept of intellectual responsibility. A scientist is expected to look at the evidence and draw only the conclusions that it warrants. Scientists who draw unjustified or irresponsible conclusions are criticized for doing so, and scientists who draw the correct conclusions from the evidence are praised and sometimes idolized.
A determinist might respond that it would be useful to praise and criticize scientists on the basis of whether they drew the correct conclusions from the evidence even if we didn’t have free will. The problem with this response is that it assumes that the speaker has free will and can choose whether or not to praise and blame the scientists. You can’t say that no one has free will and then tacitly assume that you have free will.
So, I think belief in free will should be seen as the scientific position, not determinism.