Posting scenarios such as WA did is an old scholarly, religious, philosophical technique to test the extremes and limits of some blanket statement.
Thus, it's legit. Is it likely probably not but it does cut through some of the things we see here.
It is common in the research and discussion of morality. Then, sometimes whacky things happen.
A less extreme example is the famous ticking bomb. You are against torture and then there is a guy who knows where the ticking bomb is located.
That's the idea.