For a time after the second Iraq War began on March 20, 2003, dissent against this military action was viewed as unpatriotic by many people in the United States, particularly those on the right end of the political spectrum. Arguments against the war - whatever their merit or basis - were often met by the phrase "why do you hate America"?
Now, several years later, the phrase has gained ironic usage and is more often utilized to emphasize the irrelevance, illogic, or foolishness of the original argument; see examples below.
Original usage:
Person 1: Well, I don't see why we needed to go to Iraq. Clearly Saddam Hussein was no danger to the United States.
a question that a good boy has been having for a real long time. even though he's good, he has been bad and it's plain to see. so why do good girls fall in love with him?
"hey, freddie?"
"yeah ricardo."
"why do good girls like bad guys?"
"IVE HAD THAT QUESTION FOR A REAL LONG TIME"
"IVE BEEN A BAD BOY AND ITS PLAIN TO SEE"
"SO WHY DO GOOD GIRLS FALL IN LOVE WITH ME?"