Why Do Aliens Always Attack America?

 When i saw a trailer of another movie where aliens come and try to destroy human kind i was bored. Independence Day, Mars Attacks, Signs, Predator, War of the Worlds, Battleship..the list goes on and on.  Why would aliens be interested about us at the first place? And why should i worry when i have no plans to go to America! Except E.T or Paul the extraterrestrial movie creatures are not sympathetic at all. How boring is that? I would like to see a movie where are bunch of cool aliens who would come to earth to teach us about universe, space travel and everything.