I like a theory I don't hear much talked about. They just don't want to interfere. We don't interfere with un-contacted people for the most part. Could be that

I like a theory I don't hear much talked about. They just don't want to interfere. We don't interfere with un-contacted people for the most part. Could be that ethics and philosophy ends up dictating that you stay out of it. There's speculation that they've sent probes. Could be they have little to gain from contact, and prefer to leave us to our own devices. After all, it is the right thing to do.