I tend to take the view people can believe what they like - as long as it doesn’t impact my life, and is not dangerous to others.
There is obviously a basic human tendency to believe in ‘woo‘ be it religion, psychics, horoscopes, famous people being ‘special’. We love to contemplate weird stuff too - horror and sci-fi. It is part of our innate spiritual selves, I guess - legends and stories are part of our heritage. It’s why books like The Da Vinci Code were so very successful.
People believing the earth is flat or in UFOs doesn’t personally impact me. The problem is different now - social media has changed the way we behave and assess information and many conspiracy theories have become dangerous, not just for vulnerable individuals, but all of us.
People respond to ‘black and white thinking‘ and certainty, and no longer (quite rightly) trust politicians or those with power. Conspiracy theories fill that void and provide a level of certainty that only ‘belief’ can provide.
The only solution I can see is tougher regulation of social media, however that too can be dangerous - as challenging main stream thoughts and values is important to the development of any society. Who then decides what is and isn’t acceptable? Just look back over the past 70 years at all the social changes which would not have happened if people couldn’t challenge the status quo - women’s and gay rights, racial segregation.
Years ago people got their news from watching mainstream TV news or reading newspapers, now people immerse themselves in groups, and specific news sources that only reinforce their own personal views and do not give an in depth or balanced view.
I don’t know what the answers are, but we do need to help heal the issues that have alienated and disempowered people, but without giving a platform to those that are spreading dangerous misinformation. And put in place robust measures to hold politicians and people with power to account when they lie, mislead, and obfuscate - trust needs to be regained.