Possible reason, there home planet is in a very large eliptical orbit around the sun which brings it within a reasonable distance once every 12000 years. This last happened about 11900 years ago. (hivelink)
The less reptilian aliens, the ones that act more like forgiving compassionate super demi gods rather than authoritarian vengeful spiteful prideful narcissists might be starting to arrive on earth in preparation of full arrival.
(hivelink)- Its a fun theory. Because it helps explain why the secret keepers are like, "Well yea i hid the truth in a democracy for 80 years but we are on a prison planet anyways and i protected you from knowing it." tid:4317 (1) (hivelink)
no youtube