After Katrina, when they declared it a "National emergency" they declared that no citizens were to have any kind of firearm at all. Police and military went door to door searching homes for ANY firearms. Even completely non-functional ones were confiscated. Check youtube for many, many video's.
Also consider that when TSHTF any person willing to buy / trade for ammo is also not going to think twice about killing you to take all you got. And you just gave him the ammo to do it! When people are hungry, desperate, and realize THEIR personal lives are in danger, a rabid wild dog is more predictable and safe to be around.
You KNOW your thinking. "I'll make sure I'm smarter, and in a better controlling position than the other guy."... If YOUR thinking it. EVERYBODY else is to... ANY encounter = "There will be blood."
It's more a question of who's going to pull first.