Covered above. Civil liberties, big brother state, common sense and care of children/clothes cleaning.
Whilst appreciating the very small risk of plastic bottles (e g water coke) being used as missiles at present those attending football games if they purchase a drink the top is removed.
This is very impratical particarly for children who do not have the capacity to drink the contents quickly. Bottles without tops can be kicked over if placed on the ground or even worse spilt over clothes until all the contents have been drunk.
It is time a little common sense was used and football fans were not treated like second class citizens. We get enough of that from the Stewards and The Police.
Leave the tops on treat us with respect.