That's true, and again, something that more data like this can be really helpful with. I disagree that it will steer people away from this argument though, since "victimless crime" is alive and well, despite the very moving and personal response of "parents of the children who die are very much victims." Especially given that those who libertarians are trying to convince are generally technocrats, assuming they don't bother attempting to convince those arguing from morals.