when family or no, philosophical differences make it impossible to continue with the "family" you have adopted - or were born into.
This does not mean you have to give up what you do.
It means you do have to give up who you associate with, in some cases, if the philosophical issue is important enough to you.
For me, I could never instruct in the current agencies. There are too many corners that are cut in the name of profits and promoting what a particular shop sells for me to be willing to undertake the task.
Call me a curmudgeon or whatever you want, but if I truly feel that something is superior I will not shut up due to a particular employer wanting me to. The way I see it, my duty is not first to them - its to those who I am teaching first, because ultimately my students are my employer.
The name on the check is incidental to who is actually providing the funds, and when there is a conflict of interest the party actually buttering my bread wins every time.