Late, as I wasn't online earlier.
I think it's right for someone to live wherever they want, assuming they don't cause trouble and don't bother nobody. What have you done to deserve citizenship any more than these mothers who want what they see as a better life for them and their children?
Your assumption that they don't "cause trouble and don't bother nobody" is fine if you think that increased population density in already heavily populated areas doesn't cause problems--like greater suburban build-up, more traffic, and more pollution; or that uneducated illegal immigrants don't put a strain on local and state services while lowering the salaries of blue-collar workers whom they compete against for jobs.
What have you done to deserve citizenship any more than these mothers who want what they see as a better life for them and their children?
Nothing. But bluntly, what does desert have anything to with it? People are born into advantageous situations which are not of their making, but why should they reduce those advantages? There is no logical,
non-hypothetical reason.
"But other countries restrict immigration too!" Well woop-de-damn-doo. Doesn't make it right when we do it.
Pragmatically, other countries immigration policies matter. When other countries have closed borders, and one country does not, that one country that has open borders will be disproportionally hit with immigrants. Even if, however, all countries on the planet had open-borders, human traffic would flow in two directions: from crappy countries to wealthy, livable countries or from good countries to other good countries. There would not be a lot of movement from the US to Senegal or Mongolia. This would, consequently, cause the floodgates to open very quickly, and countries receiving all the immigrant would not be able to cope.
What's your problem with immigrants, dude?
Nothing. However, a country's immigration policy should be geared to what is best for the country, and a policy of "whoever can physically enter the country" is not what's best for a country in the 21st century.
