London Has Fallen–or maybe not

I saw London Has Fallen. London is attacked by hundreds of well-armed terrorists who want to kidnap the US president. The terrorists are all over London, and only Secret Service Agent Gerard Butler can save the day. But can he? Butler wastes terrorists by the boatload. Huge bodycount in this action thriller. It’s not up there with the Bourne movies in terms of quality because the main character isn’t as interesting as Bourne, but it’s entertaining, though implausible. ┬áIs London that poorly defended?