Seems that some of the discussion has gone onto general UFO discussion, so I have a question for a lot of the UFOist's in the thread.
Okay, if UFO sightings, any of them, are actually from alien species we first have to make a few assumptions for this to be possible.
1. They are technologically very advanced, to the point where they can traverse great distances of space, either at super luminal speeds or sub luminal speeds and they can live for very long times/are traveling in generation ships.
2. They have theoretically been here for around 50 years, if we want to go back to the 60s UFO craze, more or less depending on what viewpoint you subscribe to.
Now knowing this, how do UFO sightings make sense to you? I mean... okay, you are an alien and you want to visit Earth - cool. What is your goal? Is your goal to study the planet, maybe take samples? Easy peasy, odds are you could suck up some molecules out of the air and have the DNA of enough of the earths species to be done with that pretty quick. So why fly around in weird ways at night with bright lights? Has your alien species mastered space flight, but not computer vision that can see in absolute dark? If you want to be sneaky, at your technological level you are essentially God-Class compared to humans, so it's safe to assume that if you don't WANT to be seen, you won't be seen.
Now going off that assumption, why would aliens want to be seen sporadically? Let alone the 'crashes' that happen where you find a ludicrously anthropomorphized alien inside. What's the explanation for this? Am I not considering all the variables here? If someone can offer a counter point, I would love the discussion.