Personally, I believe in determinism. I believe all of our actions are determined by physical factors and past events, and people have no 'free will'.
That's just MY belief, I in no way try to force that view on others. I don't discount the possibility of free will, but I find it extremely doubtful.
If you are interested in why I believe that way, read Holbach's "The Illusion of Free Will" and possibly Smart's "Sensations and Brain Processes" as well.