Topography and geography have nothing to do with why certain things are legal for deer hunting and certain things are illegal for deer hunting.
One only needs to look at the rest of the hunting regs to figure that out very quickly.
There aren't any restrictions for coyote hunting. None for groundhog hunting. None for hog hunting (not the hunting done at Walmart...) And, more specifically, no restrictions on caliber/weapon for squirrel hunting. I say it often, as do others, it is 100% perfectly LEGAL to hunt squirrel with a .30-'06. Don't you think that if the regulations were indeed set up with "safety" in mind that they'd also restrict cartridges for other hunting applications?
Because that bullet out of your old Springfield 1903 turns into magic pixie dust the instant you miss a squirrel, but that very same bullet turns into a heat-seaking destroyer of women, children, and minorities when fired at a deer.
-J-
I totally agree, well put.