I absolutely do not want to contribute any sort of "guns r bad" vs "guns r good" type conversation on the lovely HN, but I think it is worth noting that (some) national parks are a hotbed for criminal activity. The large and largely untraveled open spaces are attractive to people who'd like to get away with things that would be too loud, smelly, or obvious anywhere else. I don't have stats in front of me (I will hunt later today), but N parks are not always the idyllic and peaceful nature place they should be, especially anywhere near Mexico.