Sometimes, it seems to boil down to just plain laziness. I'm constantly amazed that people will go to all the trouble to make a post, and ask others to provide information that could be had by a 2-second Google search. About once a week I see someone make a post like "Where is the website for XYZ?", when simply Googling "XYZ" will bring it up as the very first hit.
Then there are the guys that make a post asking a question, when they've already made up their minds what they're going to do, and seem to be just looking for like-minded souls. If you point out the flaws in their thinking, or recommend a clearly more "correct", or even simpler/cheaper way of doing it, they throw up a smoke-screen justifying why they're stocking to their clearly flawed approach.
I remember when I first came across this, when I was in high school. I worked after school at a hardware store, and we'd get people coming in all the time saying basically "I don't know anything about XYZ. Can you tell me how to do this?". I'd explain to them the right way to do it, and they'd listen, then say "No, you're wrong.", and walk away! Of course, as often as not, they'd be back the next week, to ask for help in undoing the mess they'd made by doing it their own way. Or, they'd blame it on defective parts, despite the obvious evidence the part had been majorly abused in installation....
Regards,
Ray L.