Regardless of if it's practical to live that way in daily life, the world seems pretty determined. Everything happens because a vast amount of interactions between infinite factors causes it to. You can't really say you choose between things as many influences have been taken in by you and many things have affected your psychological state. Has everything been practically decided by the big bang? Now, this is not to say we can know everything or predict the future, but we know what's likely. Socialism or extinction may be inevitable, but we don't know yet. Socialism can only happen if people keep fighting, regardless. People will be convinced or principled or not. Science seems to agree with this, and only few, like the wrong Sartre would propose we have ultimate free will. So are there any arguments against determinism? I know there is a saying that you're freer when you recognize how your freedom is restricted, and that recognition may make your actions better, but isn't there ultimately no freedom?
Other commenters here have given some great answers. The answer is a pretty resounding: No. There is nothing to indicate that "free will" exists, and in fact it is not clear how such a thing even could exist in a universe which operates according to a set of physical laws.
That being said, this is really a moot academic point. For all practical intents and purposes we have no choice but to live our lives and organize our societies as though we had free will. Socially speaking this is a necessary pretense, otherwise nothing would get done.
Exactly, in recognizing determinism one can resign themselves to the supposed inevitable - that would be stupid, or one could go on living as if they had free will even though it's probably determined or at least random. Remember that even if it is determined your determined actions still matter. Being convinced whether or not you have free will may be out of your control, but the following actions will still affect the world.