Frank you are correct, but you shouldn't be. Here's why:
What's reasonable? That is a concept open to interpretation. Many laws and regulations of the past were considered reasonable but today are thought unreasonable and in some cases morally and ethically indefensible. Granted the wording on No Firearms Signs will probably never be considered morally and ethically indefensible even if many of us think what they prohibit is.
If you are going to post a sign on private property prohibiting an activity that failure to comply with could result in arrest shouldn't that sign be nearly impossible not to see and recognize for what it is? Consider all the signs we see daily that warn and direct us. Almost all of them are standardized in size, shape, font, height, and location. Shouldn't all signage prohibiting firearms posted at building entries be the same?
The signage at the Scottsdale Fashion Square mall that was mentioned previously is very poorly placed. If you are approaching the entry door with your focus on the actual opening you can very easily not recognize the signage for what it is. The sign is a brass plaque with decorative script placed on a pillar several feet from the actual opening. This door is located at the end of an approximately 50' corridor that is often crowed with people passing through and often stopped in conversation. Is it
reasonable to expect this sign to be seen and complied with?
You're right Frank but you shouldn't be.