True. But as I noted earlier, intelligence is curious. We would have been contacted already (or at least scrutinized with the alien equivalent of a kid with a big magnifying glass on a sunny day).
But we've only been emitting significant radiation for, oh, sixty or seventy years. Given the turn-around time, that means that, at best, we can't have attracted the attention of anything farther away than 35 light years. The galaxy is 150,000 light years across. Give it time.