Does doing something as a legal strategy automatically make it ethical?

Would you not say that it is fair (if not correct), based on Trump's history of other questionable ethics (birtherism, infidelity, lying), to assume that his settlement is likely evidence of further unethical behavior? Or should we use the court system as the infallible dispenser of all truth and ethics? If so, I think the American public owes O.J. an apology.