We prosper by working together freely. The fundamental error of modern politics is the attempt to counterfeit community by the use of government force. The efficiency and prosperity of a loving collaborative community can't be replicated by holding strangers at gun point, yet that's become the standard approach in mainstream politics.
The socialists are correct that we are "stronger together" and that we prosper through community cooperation far beyond what we could achieve in isolation. They see the outward pattern of collaboration in a prosperous community and seek to replicate it from the outside, neglecting the love and trust that must lie at its core.
The only way to build a truly prosperous society is building love and trust between people, and those qualities can't be coerced. They are developed gradually by people risking pain or loss, however small, and seeing that risk rewarded by neighbors who prefer the long term value of community over shortsighted exploitation.