Millions of immigrants have entered this country and have done well. Don’t keep dredging up old history from more than a century ago. Those immigrants that we have often seen arriving at Ellis Island at the turn of the 20th century went on to make a life for themselves. Their children got an education paid for by the tax payers which gave them an opportunity to succeed in ways that their parents could not have realized back in the old country. Look at the area all around New York City, that whole area around New York and New Jersey was populated by those immigrants and their children. They have done alright for themselves.
Being judgmental is easy for those of us not punished with being born poor in Mexico. If we were we too would seek ways to improve our lot and that of our families even if it meant sneaking into the US.