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?
Every argument for free will comes down to insisting it must exist because the alternative makes people feel bad.
In a way determinism is comforting because things aren't your fault. However, if that thought leads someone to inaction it can be harmful.