If mankind started out without any negative traits that like greed, ego, anger etc., how would it shape our civilization up to this date? Would we have created the perfect utopia or made ourselves extinct long ago? Are our flaws holding us down or are they the reason our society made it to this point?
Think of it dialectically, not in a polar way. So called "good" and "bad" have to come together in one for one to be able to surpass the apparent duality. Any enlightenment, individual or social, should come from the stage after good/bad
This is what the sages will say, on the individual level: it's not so much good vs bad as useful or not useful (to some end). We need to understand and maybe learn to control what this "end" is. Similar thing with socialism: it's not class war for the sake of one class winning, but rather abolishing class as a system altogether