The people who work at companies that seem 'immoral' are able to justify it because they work on such a small part as to avoid any feeling of responsibility.

The same could be said of soldiers in an army used for oppression. They don't feel responsible for the outcomes because they aren't the ones making the decisions, or they work 'behind the scenes'.

I personally don't judge any of them but I can see how you could argue that simply by working for such a company or institution you are partly to blame for their immorality.