[siosonel]

"If you look at it too hard all "truths" become false eventually"

My opinion is that many apathetic people become that way because of being treated unfairly (in their view) or feeling helpless, and way less people become that way because of thinking too hard.

"Or worse, change their position thanks to millions of dollars ..."

Well, I see new data: lobbying $$$ that could make a previously trusted politician biased. Time to update my simplistic model on his related political ads to being less likely to true. There might be another politician who changed positions based on new or emerging body of evidence - maybe this person is more trustworthy this time. New data -> updated evaluation.

"the masses believe the lie, doesn't it become the truth"

I'm not familiar with post-modernism or Stoicism. But I sure hope that the proportion of people who believe one thing does not ultimately determine its truthfulness. The way I would initially simplify this is to rely on the likely proportion of unbiased people who hold one position versus the opposite. And by unbiased, I simplify that by not trusting greedy people, or people who have not studied the policy or history of it or other places who've tried different approaches. I think these initial simplifications will already cut down many viewpoints and voices that I do not need hear, in order to make an informed voting decision.