This should be kind of obvious -- if they are avoiding doing awful things in the name of money, then they are leaving something on the table. You can't have your cake and eat it too. This is why the real solution is some kind of governance/regulation, because otherwise the market incentivizes being awful.
If the definition of "awful" is broad enough, I imagine most public companies will fall in the "awful" bucket, probably with the same distribution of stock performance as the whole market. If "awful" is going to mean something truly extraordinarily bad like dumping mercury into a well or whatever, I would still guess there is no correlation as I've read horrifying stories of corporate behavior at companies with unremarkable stock performance.
That doesn't stand as a reason at all. I think the big contrast isn't as you described. It's more about short-term versus long-term or conflict of interest between principals and shareholders.
But to be specific, Wells Fargo was mentioned, and their downfall was very much driven by doing awful things in the name of money, specifically.