I invite anybody to point out internal contradictions in my 2021 definition of libertarian free agency.
But as for the OP of this thread, absence of free will (my definition) does not imply determinism. If you allow stochastic processes that leaves the door open for random superseding causes, incompatible with fatalism. I do believe determinism implies fatalism but not necessarily nihilism (existentialism being an alternative).
I don’t think morality would cease to exist. Since I’m a Platonist I believe abstract concepts such as morality exist independently. I’m also a moral relativist, meaning I recognize existence of moral systems that I do not endorse. There are plenty of moral systems that work fine under hard determinism. Mine isn’t one of them, so in the interest of not chucking everything I believe about right and wrong, I’m willing to do some philosophical gymnastics.
~Max