> I asked her whether she will accept a paper without sound academic bibliography. She said no. Then why would she believe in extremist videos with shady citations and outright lies?

This is very common. I would even say the norm. No person is fully rational. Rather, people may think rationally about certain things — their "speciality", perhaps — but not about others. Everyone is irrational in some ways.

> But if what we see today has never been seen in history

Which part do you think is historically unprecedented? The technology of course is unprecedented, but I don't see anything about the beliefs of people today that's unprecedented.