Richard Davis : Many thought massacre of 20 children , six adults would change gun debate . He says we 're seeing a predictable pattern in which gun lobby blocks popular legislation . Supreme Court decision on Second Amendment allows reasonable gun regulation , he says . Comment:
Richard Davis : Many thought massacre of 20 children , six adults would change gun debate . He says we 're seeing a predictable pattern in which gun lobby blocks popular legislation . Supreme Court decision on Second Amendment allows reasonable gun regulation , he says . Davis : Congress must create system of universal background checks for gun purchasers .