Why have we been persuaded (in general) not to believe in conspiracy theories (hypotheses)?

Be open minded about them. Why not? It's a pastime for me.

Youtube has great content on anything.

When it comes to conspiracy theories my thoughts are to educate yourself and take the conspiracy theories with a grain of salt. Too many take an idea and try to tailor information to fit their theory. Don't jump to conclusions and do your homework.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.