The idea that nothing matters also doesn’t matter so you can go back to enjoying yourself and letting things matter without being a downer for nothing

generally limited world views regardless of the facts are a mental shield of people afraid of something. the problem is, the fear is so deep beneath the crust of hatred and other negative emotions that getting to it and working with it is often practically impossible

What other world views are you referring to? (excluding the flat earth example)

Religion would be an obvious one. The geocentric model maybe as well (though I haven't heard this claimed).