I dunno about "ungodly hours" but I walk alone at night on Bergen from JSQ too (all the way to McGinley Sq) and I don't feel unsafe. It's like any other big city at night- I keep my wits about me just like I did when I lived in Brooklyn. Also I don't feel any significant difference between walking on Bergen, JFK, or West Side Ave so it's weird to have that one in particular called out.