Illegal immigration is overwhelmingly upward, meaning that migrants come from a dysfunctional country into a more productive country.
The very character of the upward country is changed – and rarely for the better. The nation’s sense of unity is fragmented. The civilized culture fades into one that is less kind, more brutal, abrasive, less educated, less prosperous, often with socially corrupt moral values – causing a spike in sexual assault, theft. There is a greater struggle for resources and basic dignity.
Something that took generations to build is systematically destroyed.