What did the bugs want with the galaxy?

Wipe out the Arquillians. Frank the pug says it is the best source of sub atomic energy. The Arquillians fear the bugs acquiring it so much they are prepared to destroy Earth to prevent it falling in to the bugs hands.

This is not a 'popcorn flick'.

It's a CAREFULLY designed and planned movie that commits two atrocities in one blow;

1) It whitewashes the history of ACTUAL 'Men in Black', so people would have a POSITIVE connotation with that term. (They were ruthless thugs trying to prevent witnesses from exposing their sensitive information to the masses - and they succeeded)

2) It destroys and mutilates a repetitive one-hit wonder from the early 1980s to boost Will's career and reputation as a genius musician, when all he can do is rip off others and at best, create simplistic non-music.

The emperor's clothes are shiny and beautiful, though, aren't they? Sigh.

Lebensraum (German for "living space"). The oldest reason imaginable for war.