"We should all be asking ourselves where such big distrust is coming from."
Well, I would say it starts with basic things early, like Santa Claus brings the presents. Later you find out, oh a lie.
And so on with many things. Church, all loving god, nice and caring government, war only for peace, health corporation's only make good medicine, etc. etc.
And then things like Kennedy and 9/11. I don't know what happened and I also don't care so much, but the more I looked into it, the less convincing became the mainstream truth.
Or less controversial lies, like weapons of mass destruction in Iraq and so on.
No wonder people then start to believe in more goofy things like the moon landing hoax, or climategate - or ultimately, flat earth.
They have just been lied too often by their authorities. And then make the stupid assumption, everything opposite must be true then.