Mourn, then organize. Mourning is definitely a thing, and that fear needs to go somewhere, but then we have to collect and look at the task at hand. I don't think intricate doomsday plans are that useful; we have some solid data about what is being targeted/has been targeted before, and have a guess where to concentrate our efforts.

We have to find a way to talk to at least our friends, even if not our enemies (that's advanced work I'm not sure I can do.)