"Instead of putting safety tape and bandaids on a razor blade, how about don't give the kids the razor blade in the first place ?"
And what's to stop the kid from FINDING the razor blade on his own? Or the loose porno mag tossed over the fence? It's not like yours is the only one in existence. And I can speak from firsthand experience about chance encounters outside of any parents' possible purview (albeit the chance find for me was a perfectly ordinary fantasy novel that drew my interest in the author).