Fall 2018 Central America migrant caravan to the US

What, exactly, should we do about a group people who constitute a drop in the bucket of our yearly immigration, a thousand miles away, traveling on foot with no resources, claiming to seek asylum in the US? You’re treating this like an emergency, like a disaster - but, as pointed out in another thread:

The border patrol is more than capable of handling it. We don’t even know that there’s going to be an issue. If the caravan keeps shrinking at the current rate, there will be nothing left by the time it reaches the border. Assuming it doesn’t shrink at all, the border patrol is still probably capable of dealing with a few thousand people asking for asylum - they get upwards of 20,000 just about every single month. So it’s a tiny, slow-moving problem that may resolve itself. It also happens to get wall-to-wall coverage on Fox News for some reason - weird, right?

So why are we treating it like a huge problem? Why should we be criticizing the democrats for “not doing anything” (this may be a good time to recall that most border states do not have democratic statehouses, and that every branch of the federal government is currently republican-controlled) when there’s really nothing that needs to be done? What should the democrats be doing?