I'm an avid R&G Club shooter. I keep my regular guns MasterLock® cylinder \ slide locked and those I use infrequently in my safe. We arm our ADT system every night and with our 2 dogs (German Shepherd and Yellow Lab) as our first line of defense, between the 2; I keep my kids safe & should have the requisite time to dial 911, unlock and load...
Rule #1: Train your crumb-snatchers not to touch any firearm, ever!
My grandfather kept his pump shotgun in the corner of the dining room...unloaded. The first rule I was taught was that "that is grandpa's gun and you never touch it...". Period.
I was about three or four at the time. My grandparents raised five kids under this rule (and my great grandfather stored his double-barrel similarly) and 11 grandchildren as well! There were no deaths in our family due to firearm accidents...and, yes, we all hunt (male and female).
Rule #2: insist that your children's school present the "Eddie the Eagle" gun safety course.
Rule #3: For those of you who are too dense: unload the firearm and secure it where youngsters can't get at it.
Rule #4: goto rule #1: Klebold defeated the security precautions of his kinsmen. Respect for tools (firearms, hammers, saws, etc.) begins at home.