Well, "discerning" is one word to describe a mind, so is "closed", "biased", "bigoted", "credulous", "rigid", "pig headed", "persuadable", etc etc.
All I have done is presented evidence that well regulated firearms laws in a country result in less gun violence in that that country. Nothing at all to do with any Post hoc ergo propter hoc fallacy. I believe I have demonstrated the "necessary relationship" (whatever that means) by presenting sufficient examples where this is the case. Go as far out as Mongolia and the pattern holds true (30 gun deaths), or even a Right wing semi-dictatorship like Hungary (56 gun deaths). The result is consistent. The tighter the gun control, the less risk of being shot and/or killed by firearm. QED