I don't know why I am continually surprised how easily people are fooled, and they are fooled from all sides. They are fooled by the powerful (companies, politicians, etc.) and they are fooled by the powerless (random internet guy, conspiracies, etc.)
At some point I need to expect this from everyone and I will be less surprised.
Fun side note: no one thinks they are being fooled.
(All of this above is vague because it didn't come from seeing anything in particular today, just a thought I had for some reason.)
ETA: I assume part of the reason is that it's easier. It's easier to pick a person or a number of people you believe and just always go along with what they say.
It's harder to question your beliefs and put in effort to find out if you are correct or not. It's also harder for most people to admit they may be wrong in the first place.
"Ignorance is bliss" is not only a saying, it's real. I regularly wish I was more ignorant about many things and I would probably be more blissful.