CMV: The concept of "free will" is an obvious logical fallacy.

"Free will" is a concept that's important in many moralistic philosophies, but centrally important in christian theology. Specifically Saint Augustine, the founder of christian philosophy, adopted the concept because it could explain a world of full of suffering and evil that was supposedly created by a God who's thoroughly good. The evils in the world, therefore, all came from the fact that God gave men freedom, which is good, but that meant men could choose to place their own interests before those of God.

But I argue, supported by the likes of Schopenhauer and others, that "free will", as it is understood in christian theology, is logically impossible. “Man does at all times only what he wills, and yet he does this necessarily. But this is because he already is what he wills.” [Chapter 5 of On the Freedom of the Will]

I understand that this controversy is old, and has been discussed by many philosophers, but when brought up in discussion to this day (I say this in terms of personal experience) is a proposition regarded as a matter of opinion and world view. This can, however, be proven logically. The logical proof goes as follows:

"If you look at any decision, and ask why it was made, there are two possibilities: either there are pre-existing factors that cause the decision, or there aren't. If a decision has reasons (pre-existing determiners) it is not free, it was caused by it's reasons, which exist in the past and cannot be changed, according to causality. If it has no concievable causes, it is by definition random.

Therefore the concept of "free will" implies that people can alter the past when making decisions, in other to willfully change the causes of that decision.

Tldr: Human will is either caused by things (meaning not free) or not caused by things (meaning not will).