Sign, Sign, Everywhere a sign...

Sign, sign, everywhere a sign
Blockin' out the scenery, breakin' my mind
Do this, don't do that, can't you read the sign?
Five Man Electrical Band
I've lived in Wisconsin three months now since moving back here in August and this is the kind of sign I've seen on a number of buildings - including the ones I work in on a daily basis.
It is related to the state's concealed carry law that allows licensed gun owners to 'pack heat.'
The only thing that puzzles me is this: 
Who are the people likely to obey the sign in the first place?