Greed is fine and normal. Envy is the dangerous vice - it destroys both those that practice it and those that are targeted. Good news for Dems - envy is the most powerful of all vices when marketed wholesale.
Greed is really a subtype of envy. A person acting greedily is really trying to catch up to someone else's score out of envy, and they're willing to cheat. Like envy, most of the greedy are leftists. Most of what is called greed by leftists is really them projecting their envy onto others. True greed is fairly rare, while envy is epidemic right now. Both are contagious. Envy is evil, but it is also the spark behind human evolution. It leads to tribal warfare resulting in unnaturally fast and thorough evolution.