Everyone has choices to make. Martin could have easily not been an asshole to cancer patients or investors at his fund. You want to let him off the hook just because he said "yup I'm a dick" while he was making the choice to be a dick and profited massively from being a dick?

Acknowledging the fact that what you're doing is wrong does not suddenly make that thing right. It's still wrong. And you're still an asshole for doing it.

Of course we care. People are criticizing the pharma industry's practices and calling for change all the time. Shkreli is a particularly obnoxious symptom, but he's not the disease.