[ineedasername]

Surely at some point they'll see that what they're being told doesn't make sens

In the US as significant part of the population will believe that the political party in power is the source of everything bad, counter to any evidence. Paradoxically, evidence against that point of view is almost taken as proof: "that's what they want you to believe!".

Try talking to an ardent Trump opponent or supporter that he did even the least little thing right or wrong. It's maddening the contortions of reasoning and deflection. He's so very polarizing so the phenomena is more extreme with him but the same goes for any president in my lifetime.

Now imagine there's only one real political party, more controls on information, and a general human desire to not see themselves or their "tribe" as the villains in any situation...

The type of sentiment change you're hoping for can occur, but my own observation is that it only happens very gradually over many years or very suddenly when sparked by something cataclysmic, and that second method has as much chance of hardening the mindset with more rationalizing as it does changing it.