Why are people stubborn?

I explained to someone directly they needed to make a chance, a simple one and offered to help... and if they didn't, they injury would result. It's written in the manual, it's all over the internet they could see what I said was true.

But they didn't listen... and now they've got a Dr.'s bill and a limp.

What's the source of stubbornness? Pride?

Why are people stubborn?
Why are people stubborn?
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