EDIT: To grammar Nazis: I think it should have been 'Worst'... oh well.
Any action can be justified when given an either or action with a worse action. Torture is bad, but raping then killing someone is worse, so given a situation where you had to do one or the other, torture would be the better alternative. Raping someone is bad, letting them die is worse, so in a situation, rape is the better option. Or, maybe you think letting someone die is bad, and rape is worse, so letting them die is the better option. Either way, one is better than another, because the other is a worse action. So in your own mind, what is the worst possible action?
Any action can be justified when given an either or action with a worse action. Torture is bad, but raping then killing someone is worse, so given a situation where you had to do one or the other, torture would be the better alternative. Raping someone is bad, letting them die is worse, so in a situation, rape is the better option. Or, maybe you think letting someone die is bad, and rape is worse, so letting them die is the better option. Either way, one is better than another, because the other is a worse action. So in your own mind, what is the worst possible action?