We must tell our children never to go with anybody – even if they are asking them to do a Mitzva. I know a child who was molested because a frum man asked him to show him where the mikva was and then asked him if he wanted to do a mitzva and dunk. It used to be that we warned our children not to be tempted by candies now we have to tell them not to be tempted by Mitzvos R”L. I have told my children for years that even if a very frum looking man asks you to show him where the shul is – just walk (or run)away. It is unfortunate – but that is what we must do to protect our children. Unfortunately frum looking people can be dangerous too and our children have to understand that.
We must tell our children NEVER to get in a car with anybody unless they were told to do so by their parents – even if they know them. Once they are in the car – their chances of returning safely are much worse. But we do have to give our children advice on what to do if they are lost. We have to tell them if Chas V’Shalom they are lost to find a Mommy with Kinderlach and ask them – even if there are frum men there and not frum women with kids – I say go for the Mommy.