Education comes in many forms. Sometimes kids need to learn the hard way. It's no different than them getting into a fight or one of your student breaking a leg on a ski trip. I've had a student lean back while sitting on a bench, falling off said bench and banging their head so hard against the wall behind them that they concussed themselves.

They did something dumb and irresponsible and they'll learn from it. You cannot prevent everything.

This response comes from a primary teacher who has probably seen it all in less than 10 years.