It isn't the NRA's responsibility to teach children gun safety, and keep guns out of the hands of children. It is the job of parents to do that. No organization, regardless of it's philosophies, is responsible for irresponsible members.

If the government wants us all to have guns, then maybe the government ought to take responsibility for the whereabouts of those guns, and require gun safety classes for all owners and people who reside with them. The government is responsible for many problems related to gun ownership, and they ought to be changing laws to deal with those problems, just as is done with other social problems, like drunk driving and domestic violence. Although not much is being done about domestic violence either.