I’m not disagreeing that the internet can be harmful. Used irresponsibly it is dangerous. But the same can be said for Tylenol.
Any responsible parent keeps Tylenol away from the reach of kids who may want to try it. Adults have no desire to overdose on Tylenol, so it doesn’t need to be locked away from them. If someone was trying to break a bad crack habit, we would all agree that they should not have any accessible in the house. Unfiltered (or poorly filtered) internet would fit that category.