Yep:
The baseline historical outcome for large numbers of people (especially men) moving from one populated area to another populated area is conflict, bloodshed, disease, and death.
— John Durant (@johndurant) March 14, 2018
Not to mention massive social change, which right or wrong is hugely disruptive and undesirable to the people already living there.
Liberals can cry as long as they want — the above is just a historical fact, like that Abraham Lincoln was the sixteenth president, etc.