[bheadmaster]

One way is to reject the idea of free will as an absolute. Every effect has a cause, and the causality chains extend from the beginning of time (assuming there is such a thing). Humans are part of nature, and the causality chains also control each and every human's actions and destiny.

It's somewhat related to the Nietzsche's concept of Amor Fati:

    "My formula for greatness in a human being is amor fati: that one wants nothing to be different, not forward, not backward, not in all eternity. Not merely bear what is necessary, still less conceal it - all idealism is mendacity in the face of what is necessary - but love it."

[sanitycheck]

This is what I believe, but people who think free will exists seem generally happier so I don't try to convince anyone.

[bheadmaster]

Maybe.

But perhaps the cause-effect relationship is inverted - perhaps generally happier people tend to think free will exists, because they never had a reason to doubt it? In contrast, people who are generally unhappier are the ones who are thinking about topics such as free will, determinism, etc. to try to make sense of the world. Sometimes it works, and makes them less unhappy - but they had to be unhappy in the first place to start thinking about it.

[JohnFen]

Free will may or may not exist. But believing in free will is incredibly useful.