If you happen to be an aspiring domestic terrorist, particularly in or around Boston, with a hankering to blow up a marathon or some other large, public event, it’s been a pretty good week for you. First we learned that Boston Marathon bomber Dzhokhar Tsarnaev’s death penalty sentence has been revoked. (At least temporarily.) And now we find out that the elite Boston Transit SWAT team that was widely celebrated for bringing Tsarnaev to justice has been unceremoniously disbanded. Officers assigned to the highly-trained unit were told to turn in their special equipment and return to more regular duty. (CBS...