I think you hit the nail on the head. Prioritize quality on the sharp things. Works the same way with kitchen knives, not that you have to buy something expensive, but you should always keep it sharp. A sharp knife is dangerous, but a dull knife is dangerous and less predictable.
If you truly hate kids, this is what you have to do. Introduce dangers with plausible deniability.
How was I supposed to know the kids would use it to turn each other into meat crayons?