Wow... it would appear that Godwin's Law is in full effect.
Godwin does have a great point, but in this case we don't have the best test subject.
The movie is clearly dealing with a very white type of technologically advanced human villains who see themselves as a Superior race and are planning mass Genocide.
The movie might not have came right out and called them space nazi's, but you don’t need Godwin to tell you that the theme seems very symbolic of Nazis.
How do you know the Jocks see themselves as superior?
How do you know the Jocks are planning genocide?
What OTHER reason would they have for bringing that stuff to earth? To give us a long lasting clean source of fuel? Maybe just for a vacation or a hunting trip?
It seemed rather clear, and explicit in the movie they had decided to wipe us out.
When you decide you have the authority to commit Genocide, that would likely mean you see yourself in the position of Authority/Superiority no?
They have been visiting humans for some time, as shown by all that space graffiti, why would this time be any different?
There is nothing clear about this time being different. The robot vaguely says something that one character takes a certain way but there is no solid information at all about the plans for this last visit.
Given that they seem to be keeping an eye on us there is more proof that they were just going for their regular visit than anything else.