In your mind, and in the minds of the Left as a whole, everything can be justified in the pursuit of progressivism, but everything can be opposed (even enforcement of the law) to oppose conservatism. Constitution is living breathing when you are in charge; Constitution is a limit on power when the Right is in charge. You put partisanship over liberty and country.
On the immigration issue specifically, I would open the doors to the country...but only after closing the government benefits offices. We don't need to bribe people to come here. And, we don't want people who need a bribe to come here. Freedom has always been sufficient to attract the kind of people that make America strong. Interestingly, though, you would seek to attract not freedom-seekers, but free loading vote slaves. Your side opposes immigration from Cuba...why? Partisanship, pure and simple. Party over country, the poor be damned. The poor and downtrodden of other nations are only welcomed by the Left if they are Democrat vote slaves.