The whole point of democracy is that we don’t agree on what’s “the truth” and who is “right” and need a process for deciding what to do notwithstanding those disagreements.

Okay, how do you decide which opinion is right? Perhaps we'll... vote on it? You do see the problem here, yes?

We're talking about politics and democracy here. People will always have a diverse range of opinions on political issues where none of those opinions is objectively "right".

Hopefully one opinion that most would agree on is that in matters of fact any competent representative should pay attention to the knowledge and advice of experts.