Today’s immigrants to the United States come for the same reason that your and my ancestors did. They want to work and enjoy freedom from fear and oppression. They work and pay taxes. They start new businesses at a far greater rate than native born Americans. (Half again greater, according to Inc. magazine.)
The greatest periods of prosperity in the U.S. were the periods of the greatest immigration. We are foolish to fear immigrants. They should be considered a valuable resource for our country.
Most economists — including the ones at the Wharton School (alma mater of Donald Trump) — conclude that immigration (both legal and illegal) is a net positive to the economy (according to Inc.).
Yes, there are some criminals among them. There are plenty of native born criminals, too. Lots of the native born ones have stolen so much that they are now part of the power structure that gives tax breaks to the rich (themselves). A lot of them reside in the District of Columbia, unfortunately.