I Really Hate it when...

I know I have to do something that will make someone mad. It's difficult to take a stand: when we do this we open ourselves to all kinds of criticism.
I recently discovered a business owner with whom I have dealt with before is deceitful and engages in disreputable business practices. Proven theft of images, basically.
Now I am being asked to once again to interact and -- although not personally -- to enter into a business relationship with this person.
I have let it sit. Next, I will take a stand and offer to resign.
Makes me wonder what the real motivation is behind sustaining such a relationship.
Quite the opposite: I was thinking more along the lines of restraining order or filing charges.