[headcase]

I don't know about approaching people to explain yourself. If they come to you, then by all means explain away. Who knows what those kids in the car were thinking or saying? They could have been waiting to light up a joint and pegged you as a cop, making them paranoid you were going to bust them any second. They could have been waiting to rob the place. They could have been just amazed at seeing a real live firearm. Who knows? My advice would be that if you OC, you do so because it is comfortable to you and you think of it as just going about your life they way you normally would. If you raise peoples curiosity and they ask you about it, handle those questions in a polite manner, but I would not recommend actively seeking out people to ask if you are making them uncomfortable. That is just asking for any number of problems IMHO.