Of course we should question what we are told, but you have to trust some sources to get by in life. I don't believe that all politicians/reporters/scientists are out to lie to us, and it may just be a small minority who do really bad stuff. There are some in power who want to destroy our trust in any authority, or at least so my own conspiracy theory goes.

As for flat-earthers, I've given up on talking to them as it's a waste of my time.