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KiigelHeart said:
Can someone explain in detail how these chemicals and stimuls work and is it proven fact that you can't willfully make those stimuls to create thoughts for you? Is human brain, consciousness and even meaning of life really that figured out already? Why is there even a debate whether free will exists or not?

It's a debate for the same reason that we have a debate about whether a god exists or not. There is nothing to suggest that there exists a god, and it would require something supernatural and unscientific to exist for there to be god. But supernatural things are impossible to disprove, just like one can't disprove that there's and invisible, completely inobservable teapot that is unaffected by everything, floating around in orbit around earth where all the lottery numbers that will ever be are written down. That does of course not mean that this teapot exists.

In the same way, some people believe that there is something metaphysical that exists that allows us to have free will. Others don't believe in anything metaphysical, but just don't accept the notion that we don't have free will, maybe because it's very difficult to accept. Ignorance is bliss in this case, because the implications of not having  free will can be hard to wrap your head around.