Is is philosophicaly valid to ask (and answer) a question based on false or

Is is philosophicaly valid to ask (and answer) a question based on false or

Is is philosophicaly valid to ask (and answer) a question based on false or impossible premises? For instance, I could ask something like "If I'm sure that the baby I'm carrying is going to be an evil person, like a new Hitler, or is going to be a mass murderer of serial child molestor, what is the moral thing to do, interrupt the pregnancy or have the baby?" but the premise of this question is false/impossible because there's no way of knowing how a fetus is going to turn out as a person. How do you philosophers deal with these types of questions?

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