There are always bigger sticks.
What are they going to do, ban baseball bats? Kitchen knives?
After that, what else? Stop practice of martial arts? Cut off people's fists and feet?
But then we can still follow the knight's example and bleed on each other.
"8 dead by handgun," sure, but how many in stabbings? Beatings?
The real problem is that these people aren't being treated for mental instability and are being sold weapons with a background for such an imbalance.