It might have been predetermined, but there's still an act of choosing, a weighing of possibilities, a judgment between them, and action. And those judging them later will too be able to judge their judgment, their character, and make decisions based on that.

The existence of free will in a strong sense, has, as far as I can tell, no logically valid implications in practical terms, though it does do something profound to our psychologies: it certainly injects fatalism.