You're looking at such a short time frame, that it's not a surprise that this all seems like a new phenomenon to you.
Lets jump back to 90 years ago to Europe. Do you think the lead up to world war two was caused by a lack of critical thinking? Do you think if I sent you back to 1920 so you could howl into the wind about critical thinking if you believe you'd have made one iota of difference to the devastation that occurred?
I would like you to give me a power, that is to make critical thinking an uninterruptable process in your mind, and also have the ability to spam the shit out of you with things that you should probably be thinking critically about anyway. You would be a wreck in days. The number of things you take for granted about the world around you, things society and the social contract take care of silently and with little notice would now be things you have to think about. You would have to back process that entire queue of completely dumb shit we don't think critically about but likely should. You wouldn't get anything else done.
Instead you, me, and Mr McGhee push those things out of our mind because we have work do to, relationships to work on, food to eat, stress to relieve, new things to learn, etc. Humans require a lot of time doing a lot of illogical human crap to remain sane, and not set around being machines.