I also have one more follow-up question: how does believing that everything you do is predetermined enhance a person's happiness?
I am perfectly willing to think that for some people it might, because everyone does have different perspectives and pleasures and pains, and the same idea that some find offensive may be pleasing to others.
But I find it difficult to see how the positions being advocated for determinism would be of general usefulness even from a determinist point of view.