It's a view I used to hold, but now I'm not that sure of it. First, a company today is not run by the same people as it was 40 or 80 years ago. So the question is, how much of that immoral past is in the "company DNA", and how much of it was just the old management? Secondly, shutting down such company would work if and only if you went and jailed people responsible for atrocities. Otherwise, they'll just join other companies or start new ones and continue to do evil. And since what you really need is bad people in jail, you may as well just leave their company be.