Kids are fun. They ask the greatest questions, and generally don't have the preconceptions their elders do.
I was in a PickNSave the other day & a kid (maybe 7 or 8 years old? didn't come up to my shoulder) got away from his mom & walked in between me & the display I was looking at. Came to a dead stop looking right at my gun, looked up at me, I smiled at him & said hello, and by that time Mom was calling for him so he skedaddled.
If you're comfortable with carrying, most other people won't even notice, and the few that do will see that you're OK so they won't be worried. (Well, other than the WAVE ghouls & the Brady Bunch, but there's just some people who will never see reason.)