Why should one person live in wealth & luxury with money to burn, while someone on the other side of town, who works just as hard or harder, live in poverty?
One could also ask: Why should one person's property be stolen in order to benefit someoen else?
Because 'property' is merely something which is given to someone, and protected by State power. It is the State which created the power relationships texascindy described above, and your use of the term 'stolen' is rather silly. A better way of putting your post would be 'Why should the State cease using force to maintain the owners in the positions of advantage over the workers?'