What if we don’t, but it’s hard to live with that fact? Read an interesting interview with Galen Strawson here. A representative quote:
No one can be ultimately deserving of praise or blame for anything. It’s not possible. This is very very hard to swallow, but that’s how it is. Ultimately, it all comes down to luck: luck—good or bad—in being born the way we are, luck—good or bad—in what then happens to shape us. We can’t be ultimately responsible for how we are in such a way as to have absolute, buck-stopping responsibility for what we do. At the same time, it seems we can’t help believing that we do have absolute buck-stopping responsibility.