I see your point. However, if they were some kind of activists, we would have heard their manifesto by now. If they were simply trouble makers, I would have expected them to get bored (and maybe scared) a lot sooner. The list of reasonable candidates is a bit short. I wouldn't put it past the Russians (for example, I don't mean to point fingers) to cause trouble just for the sake of causing trouble. Also, even if this particular tactic becomes harder in the future, it shows just how pitiful the response has been. Whoever it was tested us, and we failed.