One way I've put it into perspective before is with a little visual...
"Here are your 1000 meter targets--inside that little red circle. See 'em yet?"
"Oh, let me help. Here's what they look like through a scope at 24x..."
"Now tell me again when you shot your last 5-shot group that measured .75 MOA or less and how often do you practice it?"
"Why is is called Common Sense when it seems so few actually possess it?"
Guns only have two enemies: Rust and Politicians.