Nearly everything you believe to be true is the product of carefully crafted propaganda.
If you believe the lies you’ll be a much happier member of the herd, but you’re living in a dream that can shatter at any moment. If you know the truth not only will you be set apart from the herd for life, but if you try to tell the truth to a member of the herd they’ll think you’re a liar at best, crazy at worst. Here’s one example. There are lots of others.