What is the strongest steelman against the belief that we all have free will?

i think it's pretty clear that we don't have free will

but that doesn't really change anything

also we all have to act like people have free will

wrt to justice, i think we basically have to behave as if people have free will in order for society to function

in other words, SBF's mom's proposal is not actionable

whether it feels positive or negative has no bearing on whether or not it is the truth

but imo it doesn't really change anything, you still have to live your life, even understanding that what you are experiencing as free will is illusory

If we don’t have free will then what are we doing? That just feels like a negative belief system to me