Did you expect criminals to obey the sign?
How many school shootings do you think we would have per year if schools were full of security guards?
How many bank shootings have we had this year? Do banks employ lots of security guards?
How ridiculous is it that we protect cash so well but we don't think kids should be protected?
Did you expect criminals to obey the sign? No, the sign it not meant for criminals.
How many school shootings do you think we would have per year if schools were full of security guards? A lot of schools do have security guards. Most schools DON'T have the funds to employ small armies.
How many bank shootings have we had this year? Do banks employ lots of security guards? I didn't look it up but know there are a lot of armed robberies in the US. I suspect there is not a lot of shootings because they are there to rob the place not kill people.
How ridiculous is it that we protect cash so well but we don't think kids should be protected? You have a point but there are a lot more bank robberies then school shootings.
You've touched on one of the problems with that argument, but the rest are even easier to address. Money is more easily corralled (it doesn't need to have daily recess). When banks are targeted, the goal is to leave with a bunch of cash; when children are targeted, the goal is to cause as much shock as possible. Banks have a much longer history of robberies (a la wild west and earlier), that stimulated them to have security guards. Those guards are a cost that hasn't historically been necessary for schools.