The days following a pickup truck attack that killed 14 people have brought second-guessing and finger pointing over whether additional safety measures could have prevented or mitigated the carnage.

By the time Shamsud-Din Jabbar swerved onto Bourbon Street at 3:17 a.m. on New Year’s Day, his plan seemed to have been taking shape for months. But for those who narrowly escaped his deadly three-block rampage,