Well, my daughter is 2, and she won't talk or go around random kids or adults...and I never taught that to her! But, we often watch videos of dangerous situations and I can see that she is processing it. Educating from a young age is fine. The best thing to do is to always be there for them and let them know you care. As they get older and progress through life, show them that peados are not people, but animals and they're dangerous to be around.