They are crazy, leftwing fools.
They despise wealth and success.
They despise people who organize the production and distribution of goods and services.That is, they take the production of goods and services as a fixed given, which they take for granted.
Everything about socialism discourages production and encourages unlimited demand. Nothing can be expected of such a philosophy but shortages - shortages and waiting in line for rationed goods.
Worse, socialism prevents progress. Socialism compares dreadfully poorly in the long run with the prosperity of the capitalism it replaced - the comparison between the prosperity of capitalism following a generation of capitalist progress and the want which will be observed if the same society instead turned socialist is even more stark.