The grandparent is simplifying. The goal of a democracy is to respect the will of the majority while respecting the fundamental rights of the minority. If you're not doing the first step, respecting the will of the majority, then your democracy has already failed. A tyranny of the minority is strictly worse than a tyranny of the majority.
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.
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.