When we find another civilization, what are the odds that it is more civilized than us? I think that is highly likely because we have had telescopes only a few thousand years.
So let's assume that most civilizations we might find are more advanced than us. They have bigger more advanced weapons most likely. So does it make sense to try to tell them our very new civilization exists? Would it help us somehow if they discover us? Perhaps not UNTIL our civilization is capable enough.
Other civilizations probably would have similar thoughts and therefore they would not try to contact us, until they feel they have developed enough. Which is probably never.
I mean did American Indians really want to be discovered by Europeans?