Politics
If there is one thing I keep noticing when talking politics with liberals, and particularly western european and american liberals, it's that they struggle to imaging how society would be structured when things change from the bottom up, ass opposed to the tradition, which is top-down.
Anarchy, socialism and communism are bottom up philosophies. It doesn't work by using the state apparatus to mandate social habits via systemic means, rather, any political structure that arises from those societies would be molded to fit the needs of the people.