Disinformation has always been a problem, and it continues to be.
Consider that the sky is only ever one colour at a time. Let's say it's blue rn just for simplicity. It's not red, orange, yellow, etc. There can be more false statements made about this subject than there can be made a true statement. There will always be more misinformation than truth.
Now, a lot of that misinformation is disqualified cause even the most propagandized person has eyes. But that doesn't disqualify all of it.
There are questions science won't ever have a definitive answer to, because religion makes claims on them that are unfalsifiable. Part of it is just that people need an answer to those.
I left Islam, and while I wish all muslims would do the same, it required me ro go through a series of existential crises I'd be hesitant to force on my worst enemy.
There are plenty of other factors to consider too, traditonalism, the way the human brain forms neural pathways and how it is harder to get rid of a pathway than it is to form new ones from that, nationalism or the use governments and powerful people have for religion...
The good news when it comes to propaganda though is that if those in power don't constantly exert control over the masses, then their entire hierarchy would collapse pretty quickly.
Legalize drugs, stop the war on drugs from Nixon era. It should be treated as a health problem, not a criminal one, and once they're at least decriminalized the cartel's profits would PLUMMET.
Ofc USA has probably the strongest propaganda system and has incentive for the cartels to continue existing, so I don't see that happening unless some change that's major and unexpected happens.