With that said, I think illegal immigration creates all kinds of societal problems and is unfair to legal immigrants.
The problem it creates is that there's enormous stress on those that are illegal. They live in the shadows and can be taken advantage of. My own personal experience was driving in LA and being rear-ended by someone who then fled the scene (most likely illegal). They work for less than minimum wage and don't cooperate with law enforcement for fear of deportation.
I'm a child of legal immigrants so I'm naturally biased. There is a legal system and many people every year try to go through that system like my parents did. I see illegal immigrants as "cutting in line" and I see nothing fair about it.
But I'm also human. People like Vargas had no choice (sent here as a kid) and has made a life here. I also sympathize those that flee poverty, crime and even wanting a brighter future. I also grew up in LA and know that many illegal immigrants live decent lives.. heck some of my friends are probably undocumented.
But completely opening the borders is not feasible. Creating systems that encourage illegal immigration only make the problem worse (and exacerbate the problems mentioned above).