I don't consider myself a 'liberal', although my views on some subjects lean that way.
I have never advocated allowing illegal aliens into the country.
I have advocated allowing more people to enter the country legally. The problem is that there is virtually ZERO avenue for the average Mexican or Central American person to enter the country legally without claiming asylum. And for many of them, trekking to the border and trying that is their only choice. Not just their only choice to enter the US, but their only choice to survive.
You seem to be ignoring the fact that those 'Caravan' people are NOT trying to enter illegally. They are presenting themselves at the border and requesting refugee status.
So any sort of 'wall' or 'military intervention' would have NO EFFECT on them. None.
And in case you haven't noticed, Trump has done nothing to actually build a wall. He's made lots of claims (all false) and promises, but has done nothing. He had 2 years of R control of both houses. Why is it an emergency NOW??? What has changed?
Oh, yeah. The Ds took control of the House and he wants to make them look bad.
And the fools he's conned so far are falling for it hook, line and sinker.