I have been thinking about something very similar for the last year or two now. Almost every white collar job I can think of has large portions of its workforce twisted into contributing to some fucked up aspect of the capitalist machine. The one that I think is really pernicious is the medical industry. I actually think it's worse than defense in a way.
With defense there is kind of an upper limit to how much a company can probably charge for their product because how much more dead can the device make someone? On the medical side of things though, their products save or prolong people's lives and the people in charge know that. They know that even if the improvement is only marginal, as long as there is one (and sometimes even if there isn't one), they can probably extract as much money from people as they have.