Last year, Detroit decided that it needed RoboCop. Back in the near future of 1987, a corporate conglomerate named Omni Consumer Products had the same idea, but its RoboCop wasn’t a symbol of hope. It was a cynical solution to an ultraviolent future — and the protagonist of the action movie to end all action movies. RoboCop is part of my personal action-movie canon, which (like everybody’s canons, probably) is tailed by a dismaying list of sequels, prequels, and reboots.