Moral dilemmas are therefore better models ass situations in which it is unknown whether two (or more) moral obligations can be simultaneously met, rather than as situations in which the meeting of two obligations is known to be impossible.
Van de Poel, I. (2017). Dealing with Moral Dilemmas through Design. In J. Van den Hoven, S. Miller, & T. Pogge (Eds.), Designing in Ethics (pp. 57-77). Cambridge: Cambridge University Press. doi:10.1017/9780511844317.004