MONTREAL — A car ramming Saturday at a Filipino community festival in Vancouver that killed 11 people marks at least the fourth attack in seven years in which vehicles have been deployed as deadly weapons against groups of people in Canada. Perpetrators fuelled by motives ranging from terrorism and far-right extremism to misogyny and mental illness have turned increasingly to the tactic in recent decades. Vehicles are "easily obtainable, and a ramming attack requires little preparation" or skill, notes a 2018 study from San Jose State University's Mineta Transportation Institute. The gruesome practice has also proven devastating, yielding a high...