That's it in a nut shell.
But what if they are more technologically advanced than us but are actual a bunch of dumb ass idiots. Take the US for instance. One of the most technologically savvy nations the world has ever seen, with a very energetic populace....but our government is made up of a bunch of people who go around their ass to get to their elbow.
Maybe the aliens are led by a bunch of morons too!