OTTAWA — Security guards searching bags before bar mitzvahs. Students who hide their Star of David necklaces for fear of being attacked. Synagogue services that start with staff pointing out where the emergency exits are. In the three years since Hamas unleashed a deadly terrorist attack on Israel, and Israel responded with a relentless war it says is aimed at eliminating Hamas in Gaza, life for Jewish Canadians has changed dramatically. "The society we're living in is not quite the society we thought," said Lisa Grushcow, senior rabbi of Temple Emanu-El-Beth Sholom in Montreal. "There's this feeling of a world...