I think we have a DUTY to let people look at our planes, helicopters, etc.... It bothers me when pilots can be so closed-off and cold to people who obviously WANT to see an airplane, or have the kids by the fence... you get the drift.
I never even SAW a flying machine of ANY kind until I was in my 20's, and I wonder sometimes if I could have had a good head start on flying if only I HAD KNOWN ABOUT IT. So, I do the school programs, and the airport days, etc., and try to always let kids get in the seat. It does register... when we landed in Twin Falls a few weeks ago, one of the fire guys came up and said "Man, my kids are STILL talking about you and Pepe' [my stuffed skunk who is always in my airplane]!" It was YEARS ago that he had stopped by to see the airplane with his little kids.
We're lucky to be in an area we all love, but we do need to remind people of how many positives aviation does bring to our lives. The most immediately appealing, I think, is pointing out search and rescue, and medivac work.. no one can argue against THAT, after all.
Okay, enough babbling......