Gates served us well and he's rich because millions upon millions of independent decision makers agreed his products were superior to the next best alternative. Liberals make the nonsense argument that people like Gates owe society something. If anything society benefitted far more from Gate's activities than Gates himself. That's nearly always the case. People who invented products like MRI's, miracle drugs, and laser machines or services like overnight mail, e-mail, and hotels benefitted society much more than anything they themselves might have received.
Liberals are about the control.
Jealousy is their powerful instrument for the politics of envy. By getting us to covet that which belongs to our neighbor, we in turn give them the power to confiscate what are perceived as illgotten gains of others and pass it around. In the process we all wind up being less free, less prosperous, less moral and become a nation of thieves engaged in the futile attempt to live at each other's expense. You'd think at least the church would be in the forefront in preaching against envy. But one of the greatest successes of liberals is their co-optation of America's church leaders into their evil agenda.