Seriously, I would be grateful of your views on that.
So when hearing those arguments, I have to weigh what they say against my own understanding of things. Hence rather than just follow your link, I go look at the source and extrapolate from there. It doesn't make me closed minded any more than choosing not to eat an alpaca poo and asbestos sandwich makes me closed bodied.
And there is stuff on there that I know a bit about. I'm not an expert but I've read extensively on energy issues for the last decade, and they're promoting stuff that is just wrong. To the geologist, oil is a finite non renewable resource. To the conspiracist, it's all just a ruse to enhance the power and profits of governments and oil companies. Except they don't put it quite like that. They say "Could it be that.... This one geologist says that...."
Climate change deniers use exactly the same tactics.
Could Jo Cox have been murdered by the State? Well of course she could have. Did they? I have no idea. I suspect not. Apply Occams razor.
And yes, it is a mindset, a way of looking at the world. I suspect that there is an extremely strong correlation between, for example, people that believe 9-11 was an inside job, and people that belive the government is spraying us with chemicals from aeroplanes. People that don't believe one would tend to believe neither. People that believe one would tend to believe both.