The problem is that what constitutes “healthy” varies so greatly between individuals (especially these days) that it barely carries any objective meaning, and the odds are heavily against any one person’s definition being correct.

If I put myself in the shoes of a parent, I wouldn’t trust myself on the matter enough that I’d feel good shaping my childrens’ entire world to match it. It’s such a wildly difficult thing to get right, and I’d rather they get a glimpse of the world through wide variety of viewpoints and hope they’ll use the values I’ve instilled in them to construct their own view.