Vehicle plows into crowd on Bourbon St., with 14 fatalities

Pure speculation here, but it's probably likely that the perp was radicalized by a member there, when he was at the lowest point in his life.
It's really no different than a cult (which some say about any religion but not all religions go after you) who finds you at your lowest ... and therefore most vulnerable ... point and fills you with their promises. "All I have to do to be okay is believe everything you're telling me? Sign me up."