As a fellow incompabitilist, I’ve always thought of it this way:
There are two possibilities: you have free will, or you don’t. If you do, then you should exercise your free will in the direction of believing, or at least acting on the assumption, that you have it. If you don’t, then you have no choice in the matter. So there’s no scenario in which it makes sense to choose to disbelieve in free will.
That might sound glib, but I mean it sincerely and I think it is sound.
It does require you to reject the notion that libertarian free will is an inherently incoherent concept, as some people argue. I’ve never found those arguments very convincing, and from what you’ve written it doesn’t sound like you do either. In any case, you only need to have some doubt about their correctness, which you should on grounds of epistemic humility alone.
(Technically you only need >0 credence in the existence of free will for the argument to go through, but of course it helps psychologically if you think the chance is non-trivial. To me, the inexplicable existence of qualia is a handy reminder that the world is fundamentally mysterious and the most confidently reductive worldviews always turn out to be ignoring something important or defining it out of existence.)
To link this more directly to your question --
Why bother with effort and hardship if, at the end of the day, I will always do the one and only thing I was predetermined to do anyway?
-- it’s a mistake to treat the effort and hardship as optional and your action at the end of the day as inevitable. If you have a choice whether to bother with the effort and hardship, it isn’t futile. (At least not due to hard determinism; obviously it could be a waste of time for other reasons!)
As a fellow incompabitilist, I’ve always thought of it this way:
There are two possibilities: you have free will, or you don’t. If you do, then you should exercise your free will in the direction of believing, or at least acting on the assumption, that you have it. If you don’t, then you have no choice in the matter. So there’s no scenario in which it makes sense to choose to disbelieve in free will.
That might sound glib, but I mean it sincerely and I think it is sound.
It does require you to reject the notion that libertarian free will is an inherently incoherent concept, as some people argue. I’ve never found those arguments very convincing, and from what you’ve written it doesn’t sound like you do either. In any case, you only need to have some doubt about their correctness, which you should on grounds of epistemic humility alone.
(Technically you only need >0 credence in the existence of free will for the argument to go through, but of course it helps psychologically if you think the chance is non-trivial. To me, the inexplicable existence of qualia is a handy reminder that the world is fundamentally mysterious and the most confidently reductive worldviews always turn out to be ignoring something important or defining it out of existence.)
To link this more directly to your question --
-- it’s a mistake to treat the effort and hardship as optional and your action at the end of the day as inevitable. If you have a choice whether to bother with the effort and hardship, it isn’t futile. (At least not due to hard determinism; obviously it could be a waste of time for other reasons!)