Question

What is the lesson of "the siren"?

Answer:

They said in Novardok: "Either mussar or issurim" (oih mussar oih yisyaser). In other words, either take to "actualizing" in your heart how much Hashem truly loves you unconditionally on a "regular" day (like through reviewing all the miracles and kindnesses that He is always doing for you), or Hashem will chalilah have no choice than to fire off some "fake" missiles and then shoot them down in order to hopefully get you to feel His love.