Asklemmy

Communism killed 100 million people.

Private property is required for freedom.

Markets are freedom.

Capitalism is free exchange.

Working the land gives you rights over it.

All of life is competition.

The weak die out and the strong survive.

Evolution is driven by the survival of the individual animals the are most fit for their environment.

The lymph system is not connected to the brain.

Black people have high pain tolerance.

Women have low pain tolerance.

Babies don't feel pain the way we do until they have sufficiently developed.

Human psychological development stops at 18 and after that it's all acquisition of skills and knowledge and the use of discipline and will power.

Fossilization destroys all soft tissue and no soft tissue can survive the process.

Race is genetic.

That you need a Credit Score

They've only existed since the 80s, but they're now seen as essential, and unlikely to go away

But they don't need to exist, and are actively harmful to people, and often just straight-up incorrect

Kinda weird how you started by asking an interesting question but then spend the last two-thirds of your post going full-on tin foil hat.

That would apply to a lot of entries of this list, which is a really interesting read: https://en.wikipedia.org/wiki/List_of_common_misconceptions

About 9/11 or actually any other major event: you typically get a lot of contradictory witness statements with so many people. The real picture only emerges when you have analyzed a lot of statements and looked at evidence. Thus early reporting often relies on a few statements that are found to be wrong later - perfect fuel for a conspiracy theory.

People in the European Middle Ages (5th–15th centuries CE, in case you're curious) thought the earth was flat.

That science can't explain how bumble-bees are able to fly, since their wings are too small for their weight.

The pyramids where built by slaves.

Feels like that is the major way of doing things by the current administration in my country.

Cooked ham is healthy. I think people have truly believed the ads in that case.

Right after 9/11, before they got the memo, how TV channels kept saying first responders had heard a bomb in the base of the building and later they all started saying it collapsed due to structural damage from the plane impact, and it just got accepted with no one bothering to question it. This was prior to the investigations so they couldn't possibly have known.

Bob Holness played Saxaphone on Jerry Rafferty's Baker Street.

I think the name you're looking for is called the Mandela effect.