They probably banned such videos, because on a Macro level it will cause people to buy into the notion that "all guns are evil" , and that "the guns are the problem"..... The less they see guns, the less desensitized they become to guns..... then when they do see one (I.E. on the news in the hands of a criminal), they become hysterical and equate guns as being the problem.
In my opinion, it is a very Hitler-like thing to do, and just a means to furthering their anti-gun agenda.
Nanny-State indeed!
God save the Queen Guns