The Coddling of the American Mind is a fantastic book by two authors who examine seismic shifts in the way that children/young adults are taught to view the world - particularly, the world of ideas that make them uncomfortable - and how that almost certainly is causing them great future harm.
Goes on at length about safe spaces, etc, but instead of just attacking and lampooning them (easy enough) they demonstrate rather persuasively how and why this movement arose, and exactly what the consequences have been/ will be.
A representative excerpt: