There's no evidence that the unfortunate victim of this accident was "stupid". And it's insensitive at best for you to call him that in a public forum. It's more about civility (or lack thereof) than morals. Shame would be an appropriate response to a breach of civility like this, but we all realize that shamelessness is more common these days, especially among anonymous participants in online discussions.

I think there are several things we can learn from this tragedy. One would be not to use hairspray with a flammable propellant, especially anywhere near a source of sparks. Turning off the printer and any adjacent electrical devices while preparing the bed would be a good idea. And not keeping extremely flammable items near ones printer would also be worth considering.