In all due respect, this was said during the Salem witch trials of eccentric old ladies who were then falsely accused of witchcraft. But I understand the point you are trying to make. How do we teach children to be cautious of their own safety, in the presence of people who may be outside of the mainstream of what society considers safe and acceptable behavior?
With all due respect I didn't say anywhere to accuse these people of anything. Only that people who are anti-social are known to be prone to violence. There is nothing wrong with keeping a closer eye on someone you might suspect as dangerous. Making false accusations is a completely different matter, and the witches in Salem didn't have the luxery of a fair and balanced judicial system that we have today.