If aliens exist, and if they are so smart to be ABLE to watch us from that distance, then they are also SMART ENOUGH not to have any interest in our global soap opera. They must have better things to watch on their TV's.
However, if UFO sightings are not a hoax, that would be a little different story. But, unlike Hollywood would want us to believe, they have no hostile intentions. A civilization possibly hundred millennia old or more can't have animalistic urges like we do - to be territorial, to kill, to grab what is not ours, to have "alpha"-in-the-pack issues of power games.
To all such alarmists I would have one message: If they wanted, they could wipe us off the earth before we would know what's hitting us. So relax, maybe they revisit us to show us again how to build a pyramid or something. And neutralize all nuclear sites - out of sheer friendship that we are not showing for one another.
If they also happen to be our first ancestors who genetically engineered us, then in the worst possible scenario they might come to do whatever a pissed-off parent would do - give us a spanking for misbehaving.