Clowns are more essential then a pastor

If you don't believe, then here's a way to think of them as essential. They help people deal with their psychological issues by listening to them and giving advice. They also give a sense of community and acceptance.

you're thinking of therapist or psychologist

No, a therapist is someone that helps you work through your issues, a psychologist is someone that prescribes drugs. A pastor only listens and then gives friendly advice that has been around for thousands of years (the bible). They are therapeutic, but not on the level of what a therapist can do.
Also many pastors are licenses therapists and/or psychologists.