If it were obvious psychadelics were safe, they would be legal. The war on drugs hinges on ensuring the public is terrorized.

Also, if it were obvious that there's a possibility everything you know is wrong, most people wouldn't be living their lives based on the infallibility of one particular book.

If it were obvious the power structures were not based in reality, we wouldn't have an unshakable two-party system.

None of this is obvious to the majority of people.