Maybe it's only in America that we don't have that i'm not sure, but god knows we need them. When I visited some relatives in Taiwan I couldn't help but give a second glance to the big signs, which read no guns allowed beyond this point. It had a big 'X' mark on a picture of a gun, I just wondered how effective signs like this could possibly be.
Nor did I, also, there are some really nasty ones which some members found funny, can't say I like their idea of fun, don't know where their minds are at!