"If no person ever had anything different from another, there would never be any discontent."
Incorrect. My contentment isn't based on what another person has compared to me. I don't covet. The only productive purpose envy can serve is to use it to spread understanding and encourage people to transcend their covetous nature.
If a persons contentment is based on comparing what they have to others, they're going to live a miserable life irregardless of anything we try to do. Evvy is a destroyers path to equality and contentment.
Envy is counter productive; destructive. If we were all naked, homeless, and starving, living in a state of true equality, there would be nothing but discontentment and death.
There's no way to fan the flames of envy for productive purposes, that is unless you're a destroyer.