History suggests there is no shortage of people who will throw all semblance of morality away as long as they are surrounded by people who they believe have done the same. I almost think the people who are not willing to cave in this way are the rare ones.
I've heard people justify working there (often to themselves) by saying things like, "If I don't do it, someone else will. So, I may as well do it and make virtuous use of the money."
I think some people also tell themselves that they'll be agents of change and fix things from within but that almost always winds up being another self delusion at worst and impossibility at best. There was a certain amount of this on display in Careless People.
