Considering the extraordinary appeal that forbidden knowledge has even for the average person, let alone the exceptionally intellectually curious, I don't think this is a very effective way to warn a person off of seeking out the idea in question. Far from deserving what they get, such a person is behaving in a completely ordinary manner, to exceptionally severe consequence.

Personally, I don't want to know about the idea (at least not if it's impossible without causing myself significant psychological distress to no benefit,) but I've also put significant effort into training myself out of responses such as automatically clicking links to shock sites that say "Don't click this link!"