Why do so many people dismiss strange or new ideas without closely inspecting and analyzing them?

Desire-for-Greatness
Nowadays, people just go with mainstream ideas that they see on their media and in their pop culture.

Many people act like they're open minded but are often just open minded towards new trends that get pushed in their media outlets.

They often dismiss any new ideas that oppose the status quo or what the paradigm is at the time.
Why do so many people dismiss strange or new ideas without closely inspecting and analyzing them?
Updates
+1 y
Thanks for the great participation everyone. We've gotten great answers. My next question will be less philosophical and more practical in terms of application.
Why do so many people dismiss strange or new ideas without closely inspecting and analyzing them?
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