Maybe for you, but I think the costs of a guilty conscience and fear of being discovered outweigh the risks of telling. It seems like I ought to look at the moral rules that come into play in a situation like this. Maybe the best thing to do would be to see which rules you feel most bound by, qualified by the specifics of this situation. I think to deal with this dilemma you ought to look deep inside yourself and see what your motives are for the action you might take. No principles are universally valid.
All moral principles are valid relative to cultural tastes.
The rules of the society serve as a standard. S- Brings about tolerance of other cultures. Keeps societies from falling apart. South Seas Islanders practice cannibalism. S- Standards are from a higher authority than humans.