mdd-
I was’t agreeing that the svara applies, I was simply giving a mareh makom to it.
And I am not sure it does apply, because here it is worse than your classic lifnei iver. When you pass a piece of eiver min hachai to a goy or a glass of wine to a nazir, l’ma’aseh all you are doing is giving him the opportunity to sin. But here you are actually being megareh the yetzer hara within people, so I could very well hear that it would be more chamur.