Looking at it from their perspective, the safest thing to do when encountering a planet like ours would be to just watch. And for the most part I think that is what they are doing. But they may also seek to influence us through subtle influence and limited contact. It may even be centuries before our society is mature enough to handle official confirmation.
I've already seen aliens. 1. I saw a UFO outside my bathroom window in July 2007. 2. I was underneath my cama covers and I saw flashing lights in my room, and when I looked out from underneath the duvet I saw a pair of alien feet and legs siguiente to the bed. tu have been warned!.....
There was a loud buzzing noise and the room was covered in blue light. I then fell asleep because of it. An hora later I woke up to find the alien gone. Remember this could happen to tu too.....
They will come when their shows are over!!!! And when they run outta chips!!!! My brother dicho for me to type this I get 10 dollars!!!!! He is a UFO geek por the way