I feel dirty and ashamed I make my living off of using their software.
I truly feel bad for you. For 2 years I worked directly under some truly evil people (owners of a commercial construction company). Finaly out of disgust I quit, and spent about six months unemployed (with a family mind you) until I found a better place to work.
If you really feel that strongly about something change try to change your situation, believe me it can be done.
I'm not pretending to know your situation but the last thing you should feel about your work is dirty and ashamed.
--It is a far,far better thing that I do,than I have ever done;it is a far,far better rest that I go to than I have ever known.