>Supposing free will doesn't exist, why would you think we can decide to do anything to make things other than they are?
For the exact same reason as people who do believe in free will, some combination of our inherent traits and environment made us want to change things.
There's really no immediate practical application of free will (or the lack thereof), human behavior is what it is whether we have it or not. If we all believe in it then it's very easy to say "the buck stops here at the individual" in regards to antisocial behavior. If we don't have it then the causal chain is a lot messier and one reasonably could assign shared responsibility towards institutions that encourage suboptimal behavior (such as the advertising industry).
For the exact same reason as people who do believe in free will, some combination of our inherent traits and environment made us want to change things.
Not having free will doesn't mean people immediately turn into dust, it just means the reason you decided to get a Big Whopper Breakfast Bucket™ from McWendallKingFC© has more to do with explicit and intentional psychological manipulation on their part than it does on you as the individual making a totally intentional, rational, and well thought out choice that definitely doesn't have anything to do with their highly optimized (to their benefit of course, not the benefit of your health) food and very realistic commercials of smiling happy people and great vibes.
There's really no immediate practical application of free will (or the lack thereof), human behavior is what it is whether we have it or not. If we all believe in it then it's very easy to say "the buck stops here at the individual" in regards to antisocial behavior. If we don't have it then the causal chain is a lot messier and one reasonably could assign shared responsibility towards institutions that encourage suboptimal behavior (such as the advertising industry).