There is no hiding, there is no advanced alien civilization out there “looking” for us, at this very late stage.
The age of the galaxy is about 13 BILLION years. That is long enough for a single space-faring civilization with only sub-light travel, to probe and possibly colonize every planet in this galaxy, THOUSANDS OF TIMES OVER.
Any sense of isolation we have on Earth is almost certainly artificial and intentional.
I appreciate your comments, but it seems to me that they haven't had 13 billion years to do it, any more than we have. They would have had to evolve and advance to some kind of super-advanced civilization themselves. And that takes billions of years if we're any example. And the fact we don't see them everywhere we look is further proof they have not had "long enough" to do it, or have had no interest in doing it. Perhaps attacks across many light years are so rare they're not worth fretting over. I certainly hope that is the case!