>>23553
>But that is incompatible with spacetime. So according to spacetime physics, the openness of the future is an illusion, and therefore causation and free will can be no more than illusions as well.

It is debatable. Mainstream interpretation of quantum effects explains some of these effects by using truly undetermined and random values. So, if physics are right here (there are plenty of oppose views though), we can have real unpredictability in universe. And if these micro-scale effects can influence our consciousness (also debatable though), we have free will. Penrose supports this, for example, although quantum effects may be too small to change the way how neurons work etc.