Greed (or any "wrong" mindset really) is not black and white. You can be "a little too greedy" or "a lot greedy". Your example from other comment with 30y matu

Greed (or any "wrong" mindset really) is not black and white. You can be "a little too greedy" or "a lot greedy". Your example from other comment with 30y maturities is actually nice example - that would be "way more greedy". Basically as long as your bet on higher yields and bigger risks does cause your bank to fail, you were too greedy. I am not an expert, but the explanations given make sense to me.