Part of the problem is that experts in a particular field will get on social media, build a huge following based on their expertise, then spout really uninformed (but authoritative sounding) opinions about fields they are not experts in. Eventually people lose faith in anything they say.

Tech experts, celebrities... do not have more informed opinions about politics (for example) than the average person on the street, yet they’ll jump head first into divisive political arguments that then alienate half their audience who may have had something to learn from a field they actually know about.

I know I trust people who demonstrate the maturity to not do this more than people who let their emotions/desire for attention drive what they say publicly.