I think greed is bad. When people are willing to look the other way, when fradulent AAA paper is created, worrying only about their own self interest, and then that money is used to lend to uncredit worthy borrowers, eventually the whole ponzi scheme comes down.
If you mean that hard, honest work to make a profit and get ahead are good, then I’d agree. But I don’t call that greed. That is capitalism. Reasonable regulations on lending standards should have, and could have prevented this real estate ponzi scheme.
Good differential analysis.