Knowing how they can be so full of shit hard to imagine that being true.

There's a measure of truth to it. You see a lot of anti-American propaganda online, especially on Lemmy and Reddit, but America is still a wonderful place to live, especially compared to a lot of the countries these people are fleeing from. Millions of people per year immigrate, or attempt to immigrate to the United States in search of a better life. A lot of them find it too. I work with a lot of immigrants and each one of them is considerably better off than they were at home. Like immeasurably better off.

Instead of trying to stop them from crossing why are we not addressing the cause?

A lot of those problems are outside of our ability or authority to resolve. We already do a lot of global policing, and global aid, but we can't fix the whole world, especially when sovereign nations don't want our help.

Just why are we allowing this to cause us to almost on the brink of a civil war.

You mentioned Fox News trash, so you're aware of the power of propaganda, but it seems you're affected somewhat by it too. We are no where near the brink of civil war. You're seeing sensationalized reporting about a select few wack-job opinions.

So what could we be doing to fix this problem?

If there was an easy resolution, it would be solved already. The reality is that it's a complex problem that cannot be solved within a single Lemmy post. It can't even be solved among experts all working together. It can be improved though, so getting politicians off the case, and sociology and economy experts on the case would be a great first step. It's a real problem, but it's nowhere near the "emergency at the border!" Situation that Fox News makes it out to be. Ever noticed before how the emergency at the border suddenly and miraculously vanishes as soon as a Republican wins the White House, and nothing at all is done about it, and then it magically pops up again as soon as a Democrat is in office? It's one of their hot button issues they pull out to rile up their voters. They get them worked up into a frenzy, thinking only a Republican can fix this imminent threat to America, so that they'll be sure to vote. And then as soon as a Republican wins, they stop reporting on it and the voters think the mission was accomplished. It's really underhanded bullshit.