Take a look at how the American Indians were driven from their homes for "the greater good". The government of the U.S. is still apologizing to this day to first nations peoples. We seem to be able to justify anything using the greater good as a linchpin.
Taking what you want and then using the greater good argument to justify it is the argument of every tyrant and conquerer in history.
it wasn't just the US government, it was the governments of practically every european nation. do you regret the existence of the US?