The title of your question is a bit broader than what the NRA quote speaks to, so I'll address the title.

The gun lobby (and the NRA in particular) have been very careful to mention only these three incidents when talking about background checks. This is because some other very high profile mass shootings, i.e. the VA Tech shooting which was the deadliest school shooting in US history, it definitely would have helped.

The VA Tech shooter got his guns through loopholes in the background check laws (he would not have passed a check due to mental health issues).

The broader question of "do background checks prevent gun violence" is almost certainly answered "yes".

Since the national background check system has been in place, almost 2 million people have been denied access to guns because they failed a check. If even one of these people was prevented from committing a shooting or other crime (which we can pretty safely assume at least one person out of 1.7 million was) then the porous current system has already prevented crime.

The title of your question is a bit broader than what the NRA quote speaks to, so I'll address the title.

The gun lobby (and the NRA in particular) have been very careful to mention only these three incidents when talking about background checks. This is because some other very high profile mass shootings, i.e. the VA Tech shooting which was the deadliest school shooting in US history, would very likely have been prevented by universal background checks.

The VA Tech shooter got his guns through loopholes in the background check laws (he would not have passed a check due to mental health issues).

The broader question of "do background checks prevent gun violence" is almost certainly answered "yes".

Since the national background check system has been in place, almost 2 million people have been denied access to guns because they failed a check. If even one of these people was prevented from committing a shooting or other crime (which we can pretty safely assume at least one person out of 1.7 million was) then the porous current system has already prevented crime.

The title of your question is a bit broader than the body of the question, so I'll address the title.

The gun lobby (and the NRA in particular) have been very careful to mention only these three incidents when talking about background checks. This is because some other very high profile mass shootings, i.e. the VA Tech shooting which was the deadliest school shooting in US history, it definitely would have helped.

The VA Tech shooter got his guns through loopholes in the background check laws (he would not have passed a check due to mental health issues).

The broader question of "do background checks prevent gun violence" is almost certainly answered "yes".

Since the national background check system has been in place, almost 2 million people have been denied access to guns because they failed a check. If even one of these people was prevented from committing a shooting or other crime (which we can pretty safely assume at least one person out of 1.7 million was) then the porous current system has already prevented crime.

The title of your question is a bit broader than what the NRA quote speaks to, so I'll address the title.

The gun lobby (and the NRA in particular) have been very careful to mention only these three incidents when talking about background checks. This is because some other very high profile mass shootings, i.e. the VA Tech shooting which was the deadliest school shooting in US history, it definitely would have helped.

The VA Tech shooter got his guns through loopholes in the background check laws (he would not have passed a check due to mental health issues).

The broader question of "do background checks prevent gun violence" is almost certainly answered "yes".

Since the national background check system has been in place, almost 2 million people have been denied access to guns because they failed a check. If even one of these people was prevented from committing a shooting or other crime (which we can pretty safely assume at least one person out of 1.7 million was) then the porous current system has already prevented crime.