I'm confused about striker-fired guns that advertise "double-strike" capability--the ability to re-strike a dud round via a double-action-style second trigger pull. I mean, if the gun goes "click" instead of "bang," shouldn't your immediate response be to tap-rack-assess? It seems to me like "double strike" presumes a lot: that your failure to fire is known to be because of a light strike or a hard primer, instead of some other malfunction; that striking the primer a second time will likely ignite it; that re-striking the primer will have better odds of success than tap-rack-bang. It just sounds very useless to me. What am I missing?