Actually, maybe they don't, but let's assume. I understand that in places where pedestrians are somewhat uncommon that drivers, who are likely rarely pedestrians themselves, see them as nuisances. Understanding that does not mean I think it's ok, but I get it. In most of NYC, except for those whose 24/7 town car service literally takes you from door to door for every journey, everybody is a pedestrian. Everybody should feel a bit concerned about being run over by cars when they cross with the light in the crosswalk. "That could be me" should be a pretty easy thought to get to.
