Exactly. My grandparents each came from "****-hole" countries because the countries were ****-holes. They came hoping that the USA would offer them (and more importantly their children) opportunities for a much better life if they worked at it. Opportunities that did not involve digging beets and potatoes for a living. Or being drafted into the Czar's army. Or being tortured or killed for being Jewish.
And so it came to be. And I am eternally grateful to my grandparents for their bravery, vision, and hard work in coming to the USA and creating new lives here despite the difficulty of the new culture and new language. And I am eternally grateful to the USA for permitting them to do so. I don't like digging potatoes...
Oddly most people wishing to come to the USA do so because they believe they can build better lives here than the country they are leaving behind. Coming from a "****-hole" country makes it easier to have that desire, but even so imagine how strong that belief, that desire, that hope must be to leave everything you know for a new world. And how motivated, how brave one must be to do so.
Several newsflashes for Trump. Even the worse countries have things of beauty and joy in them, not among the least being many of the people who make up the country. And wonderful people, the very ones you wish to have as immigrants, can have come from struggling (or worse) countries. Finally, the countries that Trump no doubt now considers acceptable sources of new immigrants were often the "****-hole" countries of decades ago.