Denying free will is morally debilitating
If a person is told that their actions are simply an effect of their neurobiology, discarding their notion of free will, then that person becomes more irresponsible. The very belief that their free will is inconsequential is influencing their behavior for the worse. This situation manifests itself indirectly in the self-model of consciousness. Viktor Frankl refers to this situation in what he calls pan-determinism.