Serious answer.
This whole thing is starting to remind me of The Ellimist and Crayak in the Animorphs series.
Basically they were two extremely powerful beings that played games with other creatures because they were bored. Well, more specifically, Crayak forced The Ellimist in to it, and there was also a thrid being called The One, but he didn't appear until the end of the final book, and we never got any more information on him. It was a cliffhanger never touch on by the author. -_-
Basically, I think the aliens are just some bored powerful beings who gave the humans weapons to see how they would respond to the invaders all for their own entertainment, and now they are trolling the humans for the lulz. Why else would they stick around to talk to them?
Guess we'll find out maybe next week. That is, if some one mans up. So, I doubt it.