If you read the libertarian blogs regularly (like the one you're reading) you've heard the pro-RKBA rationales. Here's a less enthusiastic stance, from Colorado Luis:
So to me, the best gun policy is not a lot more stringent than the one reflected in the assault weapons ban, regulating gun show sales, and the like -- maybe a tax on ammunition for the types of weapons that are more likely to be used just for killing people. I'd actually be in favor of rolling back sentences for crimes involving guns, because I don't see how keeping people in prison for ever-longer periods is helping us in any way. Neither a total gun ban, which simply could never happen in this country, nor a society where everyone can carry any weapon they want, has any appeal to me.
There's more there.
Update: Link, doofus, link.
