It's because Western lawmakers and the general public don't really get to know non-English people closely - they can't/don't watch Russian or Kazakh movies, they can't/don't see Iranian or Iraqi TV shows, they can't/don't read Syrian or Palestinian books, they can't/don't listen to Libyan or Lebanese music, they can't/don't understand what the people of Yemen or Afghanistan talk, and so on. The result is that these other people exist, but they're so far off that there's no emotional connection with them. The thought of bombing or killing these other people for own benefit doesn't hurt the hearts and minds of the Americans, the British, the Canadians, etc.
Language barrier is one of the reasons why wars are waged. How tragic!