capitalism is a failed economic system for a few reasons:
-it concentrates power which leads to corruption which other economic systems have done too. im guessing an economic system with less centralized power and less corruption would be more efficient and less polluting.
-capitalists dont follow the golden rule aka treat workers as you would want to be treated.
-this system is at least partly to blame for a lack of solidarity amongst people ie an injury to one is an injury to all.
-it also is partly to blame for people not being able to see things from other people's pov
-and if you really believe in living in a political republic or democracy, then how does that relate to the economic system you are stuck with.
trump bashed socialism at the state of the union. people preferring socialism to capitalism makes the capitalists perform better, much like me giving justifiably bad reviews on google makes the capitalists give me deals, or citizens protesting govt makes government more responsive.
at work if we all "whine" for donuts and coffee, the boss is more likely to buy them.
works.