According to the Brady Bunch et al.
Late last week, gun violence prevention groups - the Brady Campaign, the Coalition to Prevent Gun Violence and the Violence Policy Center - sent a letter to Secretary Kempthorne indicating that "given the heightened security risks in the post-9/11 world, as well as contemporary concerns about poaching on federal lands, we find the Reagan Administration regulation to be both necessary and appropriate."
A news release by a retiree organization states:
The current rules in no way prohibit guns in parks, but they do work to discourage that tiny percentage of irresponsible individuals who would engage in poaching and target practice at the expense of irreplaceable natural and historic sites."
Because CCW holders are the ones poaching and shooting people. Someone who breaks the law by poaching or is stupid enough to have "target practive" in a National Park isn't being "discouraged" by any restrictions.
These are the real "Gunloons" and they're going completely off the deep end.
Good ol' Josh Sugarmann has taken time out searching Google to put in his .02.
Hattip to Kaveman for the links.