Yes, there's a lot you don't seem to 'get'. Because you don't actually make any effort to try and 'get' it.
I love making liberals angry. It is so easy these days, because they find it so difficult to believe that the USA voted for Trump, and will vote for him again, and the UK voted for Brexit, twice. Anyway.
So why hasn't the US collapsed? It had no immigration legislation at all for more than hundred years after the country was founded. Thereafter there were almost no restrictions in place at all for another long time.
Almost 30 million immigrants came into the US between 1880 and 1930, just from Europe.
Democrats have been accused of abetting "mass unchecked immigration" for a very long time - so why hasn't the country collapsed if that's what they've done?
In fact, why are the states/cities with high immigrant populations generally safer and more prosperous than ones without?
Even you, blind liberal that you are, must recognise a strawman when you write one.
Must I point out to you how things have changed since 1930s? Population explosions, a second world war, the Cold War, that sort of thing? You don't think those factors might have led to a rise in borders?
Incidentally, you should do some reading about how some local infrastructure is struggling to cope with the influx of people. It just wasn't designed for such a rapid influx of people in such a short time - that is the reality. Happens all over the world wherever there is high immigration.
Sure, at a high enough level, the USA looks just fine. But dig in a little, look at the effects of mass immigration on smaller towns, and in some cases there have been some noticeable negative effects.
But anyway, all of this is slightly beyond the point, because I'm still struggling to understand why you should not deport an illegal immigrant.
Let's take the example of someone who came here - illegally - 30 years ago. They now have family. If we allow them to stay, we are saying that if you evade the law for long enough, you can get away with it.
This is not true and cannot be true, not for anything that can be considered a crime. The statute of limitations, if such a thing exists in the US, I believe would only apply once you have been charged.
It would be like saying, if I steal a million dollars and nobody notices, I'm allowed to keep it if I can get away with it for 30 years. No, sorry.
If you are an illegal immigrant, you know what you are doing is wrong when you do it. Ignorance of the law is no excuse.
Or, perhaps I will ask what penalty would you think is appropriate for someone who evaded the law for 30 years? Do we throw them a party? Imprison them and then release them - seems odd for an immigrant. Deporting them is actually the most fair.