Better preventative measures against kidnapping?

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I am always amazed when I read a story of a young child escaping from being kidnapped. These children are brave, and intelligent, and strong. I remember when I was in school all we were told was not to get in cars with strangers, and the pictures they would show of these so-called strangers were of creepy looking men wearing black clothing and black sunglasses. That's really all we got. Do you think that parents and teachers could be doing something more to prepare their children to defend themselves in case a situation like this should occur, something that will make more children brave enough and cunning enough to get away before the situation becomes deadly? I'm not sure exactly what kind of measure this would be, but it would save a lot of children's lives I think.