The one that does that argument is honestly dumb as a brick. This is a case where you can either get creative and use persuasion, deception and a myriad of other options that dont have the issue of morality or you can go and torture, not think at all and get a result easier. The goal OP wants is still achievable with other means beyond stabbing him with searing hot nails to the legs for an hour, but he is too stupid to think of other ways and so he wants to take the quickest, bluntest, evil way possible to achieve his goal, and then comes to us to find out a better alternative.