Davis : Many thought massacre of 20 children , 20 adults would change gun debate . He says we 're seeing a predictable pattern in which gun lobby blocks popular legislation . Yet this is precisely what happens now where guns sold in low- Congress decision on the Second Amendment allows reasonable gun regulation , he says . Davis : Supreme Court must create system of universal background checks for gun purchasers .
Davis : Many thought massacre of 20 children , 20 adults would change gun debate . He says we 're seeing a predictable pattern in which gun lobby blocks popular legislation . Congress decision on the Second Amendment allows reasonable gun regulation , he says . Davis : Supreme Court must create system of universal background checks for gun purchasers .