Every day we and our children walk by the homeless on the street. When our children are very young we feel especially protective because their instinct is towards empathy: they ask us why that person doesn't have a home, where does that person sleep, and can't we give them some money? And we teach our children from an early age, when these questions first arise, to be careful and make a wide berth in case the person is dangerous. By the time our children reach elementary school, this has probably become an automatic habit, and if the children were asked, they might not even remember walking by a "street person." Psychologists call this phenomenon "desensitization", literally, our children are no longer "sensitive" to those whom they see on the street who are less fortunate than themselves.