I promised my self I wouldn't do this:
But:
If free will doesn't exist, exactly where does anyone get off ridiculing or shaming a person for their views, or their behavior?
To ridicule a person for silly beliefs is to make an assumption that that person can do otherwise than that which their brain has in store for them. If they literally can do nothing outside of what their brain dictates, then that person is completely absolved from criticism.
The same would apply to a rapist, or a serial killer. Absent free will, neither should be open for censure.
I should say that I am on the fence regarding free will. But my ethics are sound, I believe. If a person behaves in such a way that they have no real control over how they think or behave, then we need to seriously examine our criminal justice system.
Shame and blame, and the predictions of those elements existing in the future, are inputs into the (entirely deterministic) decision making process. A person may not have control over his behaviour; But society does - just as the wind has control over the direction in which a leaf travels, despite the leaf having on control of its own.
The environment is hugely complex, and the results are chaotic, so that are unpredictable despite not being willed; and they are not random, despite being unpredictable.
The criminal justice system exists to influence people not to commit future crimes. Punishment of criminals is an effective means to do this, even if the criminal had no freedom to choose a different path, and is undeserving of punishment for his choices.
The whole thing as a complex mess of feedback loops, made even more complex by the brain's ability to predict (but with limited accuracy) future consequences to today's decisions, and to use those predictions as inputs into the decision making process. It's hardly surprising that this stuff is difficult to understand, or that people try to simplify it by inventing fictions such as 'free will' in an attempt to explain it - just as chemists invented phlogiston to explain fire, before they had a better understanding of how it worked.