Sharing kills ambition. Why try hard if you just get what everybody else has?
Life has about a 90% failure rate. 90% of businesses fail, 90% of movies, shows, books, internet ventures never make a profit. 90% of attempts to find love fail. It's the 10% success rate that makes all the profit, makes it all worth it. The eternal attraction of socialism/communism is it attempts to smooth out life's failure rate, but at the great expense of no longer even trying. Most people are just not culturally equipped to handle life's 90% failure rate, so their failure rate defaults to 100%.