Seems to me the symbolism's this: Many in Mexico (majorities, per Pew poll) don't think US has right to enforce border, at least against Mexicans.** A wall says "No, there is a border here and we will enforce it." And it enforces it.

** The poll question referred to "Mexicans" https://t.co/WSLSCmdr5X

— Mickey Kaus (@kausmickey) January 4, 2019

from Twitter https://twitter.com/kausmickey