DaleB
Final Approach
Maybe. Maybe not. We don't know why the OP thinks the person is mentally unstable. Most pilots are a little off in one way or another, but I know some people who, if they ever lied and BS'ed their way though a medical exam to get a certificate, I'd turn in in a heartbeat.That's a little different than reporting a ****ty driver or a robbery.
And I'm a firm believer in minding my own business.