I may be completely wrong here and, to be honest, I've not read the thread, but I'm assuming the bottle lid banning is to stop them being LOBBED as full bottle MISSILES.
An empty/emptying bottle is far less dangerous then a full sealed bottle.
Easily overcome I would imagine, if you did want to use the bottle as a missile, by jamming tissues, serviettes or bog roll into the neck if you were so inclined.