Serial Misinformation.
Why waste the time and effort? The State already did the job for them when they passed "preemption". You know, that part where all local laws were rendered repealed.
I'd rather see a concerted effort on either getting ".270" repealed, re-written, or have some definitions added so gun owners can no longer be intimidated or coerced by LEO's and Prosecutors.
I ask again, has anyone actually received a citation in any of these parks for carrying a firearm in the last couple of years? If not, then it's just a sign that has no meaning. .270, on the other hand, has claimed a victim or two and needs the attention.
Why? Serial Misinformation.
The longer these types of signs exist, the longer the general public (including the CC only crowd who does not frequent the expertise on this site) believes that it is illegal to carry in a park. I would venture to guess that 75% or more of gun owners have been duped by the local governments by leaving these types of signs in place.
Scenario...
8 year old boy is taught right and wrong by his parents. See's sign in park.
12 year old boy playing in park see's the sign.
16 year old boy is taught in school that guns are bad. See's sign in park during summer.
21 year old man buys first handgun, joins the NRA and gets his CPL. See's sign in park.
22 year old man still believes that the sign is correct 14 years after he first saw the sign.
If you see and official government sign over and over through the years you will generally believe it is legitimate. Not everyone who owns a firearm is as educated as those of us who frequent this forum.