Wouldn't it be "embarrassing" if instead of being trapped in the moon's orbit, it came after the Earth!
Probably, but then, anything small enough to be captured and dragged into lunar orbit would be too small to do any real damage to Earth. More importantly, it'll be dragged to the moon's orbit, NOT Earth's orbit, so it's more likely to careen into the path of a satellite and annoy AT&T, who probably have it coming anyway.
What I can't figure out is why they aren't cutting the mission weight by getting rid of the giant lariat and just pushing the asteroid along.
Because "just pushing the asteroid along" only SOUNDS simple and is in fact anything but.