Critical thinking. Religion and our education system beat curiosity out of people and they end up being unable to process information on their own.

Also driving. People can’t stay in their own lanes, stop three car lengths from an intersection because they don’t understand that the ‘see the tires in front of you’ made sense in low sedans with sloped hoods and not their massive SUVs with flat hood, and don’t bother signaling when changing lanes slowly.