Granted. It turns out a lot of politicians were so obviously lying about their opinions that the people voting for them had figured out their real opinions. The lie only existed to give the voters justification in casual conversation. In fact, telling the truth makes the politician MORE powerful because of an idea of "sticking it to power".

This does not lead to truth in politics, because newsreaders are not politicians. They can simply spout propaganda on behalf of the politicians they support, and the politicians can say the technically true "I support this newscaster" statement to make the people believe the lies all over again.

What it does lead to is a lot of politicians putting on a facade of goodness to reveal their selfish intentions. Much of their facade involved voting for policies that make the world a better place, and that was why you supported them yourself. With the facade gone, they see no point in voting for anything but their own selfish interests.

With no politicians you can trust anymore, you vote for the only person on the ballot who still claims to have your interests in mind. If they're on the ballot sheet, you must be able to take them at their word, right? Politicians can't lie anymore, right?

Trump was not a politician.