Earlier quoted context omitted.
Immigrants are people whose lives matter. the should be given equal rights and equal value, because even if they are deemed "useless", their kids or grandkids might contribute to the future of humanity.
You don't kill an immigrant when you refuse to give him access to a country. It has nothing to do with the future of humanity and everything to do with the future of the country. (Edit: I am an immigrant. And of course immigrant lives matter. All human lives matter)
The poor have only their labor to trade with. systematically discriminating where they can work, destroys their lives just as much as slavery can. It's stolen wages.