If you want to encourage wise people to contribute then you might wish to give careful and critical thought to why they don't and, in some instances, why they try and then fade away.
You wish for the impossible.
When MH370 went missing, I made a lengthy post about the difficulties of an open ocean search. My background - 27 years in maritime aviation, including countless SAR missions, qualified sea survival specialist, SAR co-ordinator etc etc. My post got randomly modded off the thread for no reason that I know of (it was politely written) whilst all manner of childish fantasies were chewed over and debated by all manner of trolls with zero idea of the subject.
As a long time contributor I have experienced and witnessed many anomalies like that on this site - it's no big deal IMO.
This is the internet/social media. It is what it is and whilst we may like to pretend otherwise, for must of us it is just entertainment, with the odd bit of useful research chucked in.