We don't have to believe in it, but we have to act as if it does exist
People can't be excused everything they do, just because they have no control over things in the way people traditionally think
I mean there are reasons for saying it is wrong to do this or that, and putting people off acting in ways that are harmful to others. Therefore we need to respond to those things as if they ARE based on free will. to deter people as much as we can from doing it