Yeah that’s my takeaway from that argument as well. If you have to be threatened by some vague notion of a future punishment in order to not be a complete dickwad, you’re clearly not a good person.

Why be good if there’s no hell? Because to live is to suffer. Society sucks. Accepting that, working past it, and being kind to those around you makes everything slightly more bearable. You are to be kind to others because it’s the right thing to be.