What do you think about the parallel I was trying to draw between the video I mentioned and this guy's question about paying for rape? I thought the reason that someone's interest could be caught by the video is similar in nature to the reasons someone might wonder "is it okay to pay to hurt someone"? And that train of thought leads naturally enough to "Well how much harm is permissible for what amount of money?" which leads naturally enough to imagining specific circumstances.
And those trains of thought are similar to the thought behind people's ancient musings about other tricky question of morality like the trolley problem. It's not peak philosophy it's just ordinary human thought. You shouldn't be so afraid or repulsed by it or whatever.
You're probably right about this specific dude's motivations for posing the question, but I think I am right that this type of thought is entirely normal and even common to have. You are right about the dismissiveness too, sorry.