Your political opponents think exactly the same about you, though. Your belief that "truth" would be objectively measured and enforced is pretty naive. Especially if you count "refusing to acknowledge problems that are inconvenient" as untruth.

Look at it this way. Huge numbers of Americans and especially Democrats believed for the longest time, and many still do, that Trump was a Russian spy. The entire "Russiagate" phenomenon was investigated to ludicrous depth and found no evidence such claims were true; so does that mean every journalist and Democrat politician that fueled those flames now goes to prison, or can't speak in public anymore? Think about what you're arguing for here! That was an absolutely massive factual inaccuracy so how would it be held to account?

And let's not even get into cases where someone genuinely believes they're repeating something true, which turns out not to be. If that were the case, given the replication crisis in science virtually all politicians would end up being unable to speak publicly as they'd have repeated the claims of studies that later didn't replicate.