Well, more generally, anyone who has a nonstandard set of ethical beliefs, and is basing their company around that set of beliefs, can't really go public without their belief-set being thrown under the bus of their shareholders' belief-set.

For example, I've often considered starting a company in the game industry that actually hires experienced adults and treats them well, rather than hiring fresh college students and burning them out. I imagine, though, that if my hypothetical company became publicly-traded, I'd be forced to relinquish this policy in the name of short-sighted market competitiveness.