I’m a Jewish fashion editor. Galliano’s Met Gala should happen — even though it’s deeply hurtful.

It’s hard to light a dress on fire without triggering fire alarms, but I did it in 2011. First I knocked down the smoke detector in my tiny apartment with a Swiffer. Then I doused the dress — a Christian Dior cotton mini by John Galliano that I’d scrounged for $65 at Goodwill — with...