Sometimes I have to remember to take care of myself and not interpret for people, organizations, or situations that I consider abusive.
If I think a certain company is scamming people, then I don’t have to interpret for that company. If a certain client is abusive to me and/or everyone s/he communicates with, then I don’t have to interpret for that person. If I am so disturbed by what I am interpreting that I don’t feel I can remain impartial and interpret faithfully, then I have an ethical duty to abstain from interpreting.
Most important — for the preservation of my own mental health — I have the right to refuse to interpret for anything or anyone that I conscienciously object to. And I will exercise that right!