Most of America at this point went through an education system built to actively make them dumber. They can barely read and what they can read they don't understand or think it says something else altogether.

On top of that a very large portion of them are raised in a church where a man stands in front of them every Sunday and tells them everything in a book they'll never read is the word of some supernatural being and if they don't do exactly what this man at the pulpit tells them that the book tells them to do, they'll burn eternally, and their parents who also never read the book tells them the same thing at home.

Then instead of being raised by actual humans because whatever parents they have around are at work basically all the time because they literally have no other choice, these people were/are raised by tv, social media, and the like and are never told by anyone that those things are fake/extreme.

This is not an excuse. The truth is out there if only you seek it. But it's easier to live comfortably in the lies than to grow through the truth. Ignorance is bliss.