So did the Wakefield shooting and the Mark Barton murders. The trouble is, those events don't prove much either way.
Rhetorically, the burden of proof should be on those supporting the ban, and they've never been able to provide that without heavily massaging cherry-picked statistics from sympathetic authors. Even then, the "proof" is tenuous at best.
In the depth of winter I finally learned that there was in me an invincible summer.