Open this photo in gallery:Belleville Police Deputy Chief Sheri Meeks speaks to media at the scene of the shooting outside the Sons of Jacob Synagogue. It looks likely that only through an officer’s heroic actions were the congregants spared unfathomable bloodshed, the editorial board writes.Sammy Kogan/The Globe and MailOn the eve of Yom Kippur, the holiest time on the Jewish calendar, a man armed with a shotgun attacked the Sons of Jacob synagogue in Belleville, Ont., a dangerous escalation in a cycle of antisemitic violence in this country.It looks likely that only through a police officer’s heroic actions were the...