You do raise a good point about HOW do you do your own research..
If you werent taught either in school or by your parents, how to evaluate a source of information and decide whether that source is biased, credible, useful etc... then I can see how that is difficult.
These days anyone can post something online and pretend to be credible, meaning the rest of us do have to work harder to figure out whats real, whats fiction, whats horribly biased bullshit.
I look at who wrote it - if it doesn't say... that's going to the bottom of the credibility list.
If it says but I can't find out who that person is, what their level of education is, what their qualifications are - again that might well drop them down the credibility list.
If I can find out who it is, and what their level of education and expertise is (and I might have to wander off on a side-track to discover if their qualification is actually worthwhile, there are many that aren't), then I have a bit of a clue as to where they are coming from and what knowledge and understanding they are basing their opinion on.
It isn't actually easy, you need a critical mind and a good level of education and general world knowledge to evaluate some of the stuff that is written.
I have to explain this frequently in my own work as a dog trainer - people watch folk on tv, the man on tv claims to have a qualification that makes him a Master Dog Trainer, so he must be an expert, right?
But if I go and look up the organisation that awards a 'Master Dog Trainer' qualification, I find it is regulated entirely by itself, to gain that qualification one simply needs to pay a fee and self-certify that one has the skills and experience needed and hey presto... you too can have a Master Dog Trainer qualification..
So being on tv, purporting to be an expert and holding a fancy sounding qualification turn out actually to all be meaningless when it comes to evaluating the quality of that persons knowledge!
It gets even harder to evaluate sources when you are wedded to an idea and take it personally if that idea or concept is challenged by someone else - that shuts you down and stops you listening to others, and if you can't listen to and evaluate others opinions and ideas... you won't challenge your own... and so the cycle continues!