The feel-good phrase of the 20th century was “From each according to his ability, to each according to his needs.” That innocent-sounded phrase caused much misery and death.
The 21st century equivalent is “Diversity is strength.”
I suspect that in the long run the second mantra will cause more destruction and misery. A country can survive a socialist economy while retaining some of its culture and identity, albeit in bad shape. A western nation cannot survive being inundated with Third World savages.