NRA and gun crimes

12 year old shot and killed his teacher at school.  He was not shot dead, he killed himself.  How is it that he had the access to guns at all?  How could it be that we still have no legislation that could have saved the life of the teacher?  

A said she NRA is bad and its money is doing it.  Just by the media sensation, just by the way gun enthusiasts give off their money, NRA gets the money.  Even when so many get killed. 

I do hear opinions against easy guns.  Meanwhile, the Senate still has not passed the bill that prohibit felons from purchasing guns.