parent genti rustemi 45 , dropping off daughter and refused to slow down .
he took child to school , then returned and punched lollipop man john doyle to the floor in ` repugnant ' attack in front of schoolchildren .
chip shop bosses admitted attack and given suspended sentence .
grandfather says rustemi 's failure to stop was ` like going through a red light ' , and both he and the children ` could have been run over '