There are people in the public sector with a range of experiences that have no equivalent in business, but are essential to governing, like keeping a kid in school or helping someone get and hold a job. The value of those skills can't easily be measured against a bottom line.
I'm not really concerned about boundaries. I just follow my conscience and my heart. Follow your heart. That's what I do. Compassion is something I have a lot of, because I've been through a lot of pain in my life. Anybody who has suffered a lot of pain has a lot of compassion.