And these mirrors are made of what material do you think?
To be honest, I've never tried breaking one but I'll happily stand corrected if they are shatter proof polycarbonate or similar. My point was that it is very easy to fashion a weapon from what is already on board. I guess Mr average terrorist is a bright chap and those training camps were not disbanded the moment they found out that we were insisting on polythene bags and confiscating nail clippers. Instead of using the mirror in the loo, they can smash the litre bottle of Gordons that was bought airside. It's a nice shade of green too so it will match their corporate colours.
It's time for profiling passengers if only our politicians would "grow a pair" and get serious on security.