Just because some dangerous item will never amount to a large proportion of killings, doesn't mean it should be legal.
I mean an eccentric millionaire could conceivably own a howitzer, if it was legal. But we probably shouldn't let them.
I'm interested in the description of assault rifles as Poodle Guns, since it reminds me of the dismissive attitude towards relevance of clip size. Why did anyone bother developing such things, then? Should we go back to giving all our soldiers bolt-action rifles?