First came the cars of the United Nations, then two coaches with blue paintwork. And then came a wave of emotion - proof that the heart has a power that the head can't always match. How to explain the logic of people desperate to return to the shattered ruins of Gaza ? To leave behind the safety and sanctuary of life in Egypt , and to rush back to a place where you search for running water, dream of functioning hospitals and fear the effects of airstrikes, collapsing buildings and unexploded