It is the old idea that in a communist world everything would be wonderful, when the pure reality is that if all the wealth of the world were confiscated and distributed equally, the next day there would be rich and poor again, because some would save and invest and others would spend it all immediately on whores and drugs (to give extreme examples).

The only way to ensure "equality" would be, the next day, to confiscate again those who save and invest to give it to those who have spent it on whores and drugs.

And we would all live happily ever after.