What makes people irrational thinkers?

[Belacqua]

I am curious what you would say and how you would justify your own metaphysical beliefs.

Everybody's a naive realist when he goes to the supermarket.

Beyond that, I try to follow my own advice, which is not to believe metaphysical statements. One holds them tentatively to contemplate possibilities. 

Contingency is just when something isn't necessary. Science is happy to accept "brute facts" -- "it's that way because it's just that way." This is appropriate, because science doesn't deal in the metaphysics underlying the facts. The necessary conditions required for brute facts to be true are usually metaphysical issues. 

You have said that asking questions which can't be examined scientifically is a waste of time. Other people find these questions interesting, though unprovable.