You can't teach a three year old anything, you as a parent have to TAKE CARE of your children by being responsible, locking up your gun, using a child safety lock, making sure your child will NEVER get his/her hands on it. It is very fortunate that this little girl did not die!
Zat you have Pro-Gun confused with Pro-Gun Safety. There are LOTS of irresponsible PRO-GUN, Pro NRA people out there. I meet them all the time when I take burglary reports at their homes. They've had their guns stolen from the bedside table, the top shelf of the closet, under the bed, the dresser drawer, etc. They don't lock up their guns, because they want them available in their bedside table for that one in ten million chance that they'll be the victim of a home invasion robbery (the majority of which appear to actually be drug rips, so if you're not selling drugs you probably have a better chance of being hit by lightening). So instead, they will risk the health and welfare of their children who are much more likely to harm themselves or others when they find that hidden gun. They risk the lives and safety of their family members and others when they get into a domestic dispute, or when they mistake a family member coming home late for a burglar, or they have a mentally disturbed family member who decides that today is the day that they become the next Harris or Klebold, or Lanza.
I've not read the sort of fantastic parenting advice this "father" writes, but based on the description in the story, he's a Christian conservative, pro-NRA (probably an NRA life member), gun nut. Obviously, pro-gun, not pro-gun safety.
The pro-gun safety folks would like universal background checks (to keep guns out of the hands of people who should not have them), greater use of child safety locks (you know to keep children SAFE), use of gun safes (you know to keep guns from falling into then hands of criminals when your house gets burglarized), limited size for magazines, etc. We know we can't eliminate guns, but we can certainly make owning guns safer, and make life safer for those who would rather not own guns. Oh, and full disclosure, I own three guns, and I'm looking to buy a fourth this year. Will never be an NRA member, and I'm pro-gun safety!