Why is it that some people double, triple and quadruple down on their opinions even when faced with 50 years of peer reviewed scientific studies?

I will not name the person, nor will i mention the gender, Reason being is this person normally has well thought out honest and good opinions.

We were having a debate about something near and dear to my heart, Gaming. this persons opinion is that gamers no matter the circumstance are fat, lazy disgusting negligent worthless people. Of which i am none of these. Never have been, and i have been gaming since the mid 80's. Of course im going to defend gamers. I cited studies that span back 50 years to current, which show the influence gaming has had on technology, computers them selves, the sciences, aerospace, and medical.. This person just doubled down over and over. I came to this person with facts, and she responded only with faith and feelings.

Someone please tell me why people can be so blind to the truth?

Why is it that some people double, triple and quadruple down on their opinions even when faced with 50 years of peer reviewed scientific studies?
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