> It's interesting then that all the countries in the world with the highest median income are all capitalist countries.

That's a very valid argument until you realise there are only 4 socialist countries in the world. One of which is sanctioned to oblivion for making nukes.

A better example of why pure socialism sucks is eastern european countries who were worse off when they were under ussr occupation due to all the looting and stealing and are now faring much better.