Just repeating a lie over and over makes people believe it.

Its called the "illusory truth effect".

The illusory truth effect is a cognitive bias where repeated exposure to information, even if false, makes it seem more true. This effect can lead people to believe misinformation simply because they've encountered it multiple times. It's a powerful phenomenon with implications for how we form beliefs and can be exploited to spread misinformation.

So if the news says over and over that one things true, and even though some of us know its not, most normys are going to believe it because they are ignorant of how reality works lmao.