For immigrants who are immigrants not by choice, their life choices are often shaped by western powers’ military and foreign policy decisions, sometimes having a home that isn’t perfect is the best that they can do.
That’s assuming people want to come to the ‘bastion of freedom’ that the U.S. believes it is, when no one really believes that anymore. (I would say the ‘migrants at the southern border’ are also doing it out of desperation for relative stability, not ‘freedom’)
For the vast majority of people with good passports (myself included), you may emigrate but your immigrant calculus is completely different. Especially if you are emigrating not because you have too, but because you want to. There are doors open to us that will never be even slightly ajar for many others.