One quirk of quantum mechanics is that, in the realm of elementary particles, things are probabilistic.

Knowing that our mind and body are made of these elementary particles, perhaps this probabilistic nature of them provides a basis for free will and moral responsibility despite a deterministic world.

Probabilistic may it be, if we claim ownership of our mind and body, it is inescapable that we shall bear responsibility for whatever number their roll of dice lands on.

Things may be deterministic, in the sense that whatever we choose to do or not do, is caused, and arguably controlled, by an earlier event, and it by another. All of which are beyond us. It is then unclear how we can be responsible for our decision given that we are simply one part of a deterministic casual chain. For we can always soundly reassign our responsibility to an earlier event that determine our action.

If our mind and body, like everything else in the universe, are made of particles which are probabilistic in nature, this would mean that every part of the deterministic casual chain has a say in how the next event unfolds. Probabilistic may it be, if we claim ownership of our mind and body, it seems inescapable that we shall bear responsibility for whatever number their roll of dice lands on.

To be, or not to be, that is the particle.