Seriously now, bannig every trivial item or behaviour that once got abused is not only ineffective, but also dangerous. Because 1. Every trivial item or behaviour is subject to being abused, and if you keep banning them one by one as soon they get abused will create a system that it's unusable and inhuman 2. That system will not protect from the very danger it was created to protect people from. It's the wrong battle to fight. The enemy is not everyone who goes to the toilet and drink bottled water. The enemy is someone who wants to kill people, and will use whatever means necessary to do that. As soon you ban something they did, they will come up with something new, and will attack in a way no one thought before, and get people by surprise, while they are busy fighting everyone who just wants to got to the toilet and drink water or read a book.