That frustration and shame are going to affect your productivity sooner or later which in turn affects your future job prospects. Compartmentalization can work for some people, but it sounds like you have a real ethical boundary here. Our industry generally has a great deal of mobility, there are definitely great companies out there which require your skill set and have a great company culture, you don't have to settle for less.

Also don't trivialize the psychological impact that this can have on you, especially if you find yourself thinking about this off work hours.