Going to Area 51
Consider the possibility that the captured aliens want to go back home but the govment won't let them. So the aliens are using mind control to attract the large crowd to Area 51 as a diversion for their escape. It is possible.
If the aliens do escape, we will never be told, but after being held for years here on earth, they may not be happy campers and may be out for vengeance after they get back to their home planet. Will be interesting to see what transpires here on earth in the weeks after the Area 51 event.