The way I look at it is inviting a bunch of highly advanced (as in interstellar travel advanced) aliens you've never met, and know nothing about to your crib (assuming they show up, of course) is the tech equivalent of online dating at serialkillers.com. NOT gonna end well whether they're friendly or "the other kind".
Interesting you say this, because all of our transmissions are leaking into space anyway. That was the whole point of this topic. They may not literally be watching Bonanza, but they can probably pick up our signal if they are at least as advanced as us and actually looking for it. If they are out there, us trying to avoid drawing attention to ourselves and actively trying to avoid contact would be synonymous with Mormons knocking on the door, you visibly peeking through your blinds and yelling, "no one's home!" They know you're home. Just like aliens would know we're here.
The way I see it is, our planet is relatively stationary on a cosmic timescale. We have no where to hide. So if there are aliens out there, we might as well extend a hearty handshake and await an answer. If something does come, no matter what it is, good or bad, odds were it was coming for us eventually anyway.