Don’t throw stones in glass houses?
Capitalism does operate out of envy and self-interest, but because capitalism directs envy and self-interest towards the greater good. No matter what you think, humans are humans and people are self-interested and often envious. A capitalist system with strong protections for individual rights and equal justice ensures that the envious and the self-interested have to compete with each other on the merits in a free market. If you envy your rich neighbor, you can’t just take his money, you have to go into business and produce something that other people want more. And to the extent that the rich neighbor can use his money to influence the government to keep you from competing.