I agree.... I'm pretty sure that MOST of the cachers out there are interested in the safety and conservation of the areas they hunt / hide. I know I am.
Possibly the only legitimate concern he could have would be if this was a park for residents only ???
I know we have many in my area that are town parks, for the use of town residents and their guests... that being said, nobody worries much about who hikes, or sits and reads a book, or even fishes in them... the only time it ever becomes an issue is for sports field use, or other similar amenities... I think they just try to make sure that residents wont be crowded off a volleyball court, or baseball field, or the like by non-residents.... But hiking or caching???? I cant see anybody, except this one mayor obviously, being too up-tight about it.