I certainly hope that as many people as possible want the Wall taken down, because it’s so terrible and foolish in so many ways.
The part I can about most, of course, is the massive amount of death, destruction, desecration and suffering it causes. There is almost never an actually good reason to build a giant wall in the wilderness. People who want walls through the wilderness, let alone across an entire continent, should never be in positions of power, and need to be reeducated (or ought to be educated in the first place).
Other reasons include the colossal waste, stupidity, and inhumane terribleness. And even for people who are xenophobic and heartless enough to think they want to keep all humans completely regulated or unable to cross the border without being passed by the lovely and ultra-super-greatly-well-trained human beings of ICE, well, they should understand that a wall doesn’t accomplish that.