Ethics are important in business, but insisting on ethical and decorous dealings with someone who is brazenly neither of those things (i.e. blatantly ignoring court rulings) is a fool's game.
Assume positive intent and work ethically and in good faith, but if they clearly demonstrate to you that they don't have positive intent, you don't need to be a punching bag.
Assume positive intent and work ethically and in good faith, but if they clearly demonstrate to you that they don't have positive intent, you don't need to be a punching bag.