What are the arguments against the existence of Free Will?

Two schools of thought dispute the existence of Free Will: the soft determinists and the hard determinists. Soft Determinists believe in partial Free Will. Kant says that we can't control the emotions we feel, but that we can control whether we act on those emotions. Basing decisions on Reason means that we act independently of prior events.

Hard determinists believe that Free Will does not exist. They assert that our actions are a result of prior, external events beyond our control. For example, a TV advert may determine me to buy a new washing machine. They believe that our sense of responsibility over the actions we commit is an illusion.