I liked this quote, from your second link:
"In an ideal world, citizens would be able to maintain constant vigilance, monitoring both the information they receive and the way their brains are processing it. But keeping atop the news takes time and effort. And relentless self-questioning, as centuries of philosophers have shown, can be exhausting. Our brains are designed to create cognitive shortcuts — inference, intuition, and so forth — to avoid precisely that sort of discomfort while coping with the rush of information we receive on a daily basis. Without those shortcuts, few things would ever get done. Unfortunately, with them, we’re easily suckered by political falsehoods."
It really is just too exhausting to check everything thoroughly, and you have to fall back on 'shortcuts'. Some people on the other end of the spectrum opt to check nothing and focus instead on just being in touch with what 'everyone is saying,' which is sometimes, weirdly, more important than the truth.