What is the main purpose for having a purpose?

I've spent a lot of time learning, and trying to understand why having purpose in life is so important. I finally came to an understanding. Having a purpose in life, and following through with it, gives the person both a sense of meaning, and worth in their life, as well as fulfillment. When one feels like they are fulfilling their purpose they are much more likely to live a happier, and more enjoyable life. As well as feeling as though there is worth in their existence. Fulfilling your purpose here can make people feel whole, and feel good about themselves.

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To satisfy a feeling of belonging or want for yourself to fit in.

The idea of having a purpose is a "benign delusion" that helps most people cope with life's meaningless stresses and incomprehensible disasters. If you can find a way to abandon the "benign delusion" of having a purpose and still cope with the hard parts of reality you might do better. However if the "benign delusion" of having a purpose includes other people, I cannot recommend abandoning it as that may be less benign than just keeping the delusion undisturbed.

The function in evolution of "benign delusions" such as having a purpose, etc. are usually to assist binding human societies, human groups, and human families together. The systems in the brain for their formation evolved long before language did (most primates and some other mammals and certain bird species also can form them), so beliefs had to form faster than they could be verified. Now our language often shows us the beliefs formed in "benign delusions" are wrong and that is very hard to accept.

The very same brain systems that support "benign delusions" can support clinical delusions, causing many mental illnesses. The very brain wiring that helps hold our societies and relationships together, is the root of delusional mental illness.

Really,,,,having purpose is a "benign delusion"?? Then just about every human being is delusional. Explain that concept please. The simple purpose of keeping oneself alive and well is a benign illusion?