So you do accept that empires were created simply to satisfy greed, the pursuit of wealth, power and influence?
There was some religious fervour reasons as well. Probably doesn't explain the first crusades against the Muslims. But, for now, let's discount the religious pursuit of who's God is the true God.
Now that you accept that empires were created out of pursuit of wealth, etc, with all the associated atrocities that ensued in that pursuit.
How can they possibly considered to be good, or beneficial to the indigenous population.
I suppose you think the aborigines in Australia benefit from the immigration of white settlers?