Mostly agreed, yes. But I would rephrase it as "introducing kids to $bad_stuff without guidance is a bad idea": I don't think that permanent supervision should be required. Once the novelty wears off, and the parent is confident that the kid can behave themselves even in the presence of $bad_stuff, even "putting your kid in a room full of $bad_stuff" can be fine.

And I don't mean that in the sense of "the kids are fine with their heroin syringes", but in the sense "I can leave the cookie jar on the counter and it will still be there when I leave the room".