Eh. Responsible consumption of media isn't something we're magically endowed with when we turn 18. It's a skill like any other. Obviously there's a point at which children are too underdeveloped to be responsible about media consumption, but teenagers aren't idiots. If a youtube video is feeding them bullshit, they'll usually be able to tell. Not all teenagers are that savvy, mind you, but we've learned in recent years that not all adults are either.