Good Lord! I'd call it a tempest in a teapot, but for the fact that there's barely a shard of a teapot. LEOs have much better and more important things to do than deal with than DU's internal cyber-squabbles. bn needs to put on her big-girl bloomers and ignore this "letter" - be ... brave - regardless of who sent it.
If DU's Alert-Jury system is so freaking game-able, DU doesn't deserve bn, and she doesn't need DU in her life. Though I have to say, if she's as loony-toony as TMN or r1, maybe they do deserve each other.