By definition, if you buy something, do stuff to it, and then sell it for way more than you paid... you're literally making it more valuable. If they "ruined" Safeway, how did they sell it for more and make a profit?
The hard part is the "do stuff to it". That often means firing people, selling assets, etc. People don't like change, and its rough on those that get whacked. But some of these companies would have gone Chapter 11 otherwise, and then everyone gets whacked.
Trying to preserve struggling companies so they never have to change or do painful or difficult things is a recipe for disaster. How did you go bankrupt? Very slowly, and then all of a sudden.
You're not wrong about PE being very bad sometimes. I'm just arguing that it CAN be a good thing too.
My final comment on it is this fundamental of business: