The opposition to the wall has not been articulated in a logical and coherent way. There is currently no argument behind the opposition to the wall that is based on anything but dumb obstructionism. “It’s not going to work anyways,” which is why I don’t support it, is not an argument. It’s an emotion.
If nobody came up with such an argument in over two years, that must mean it doesn’t exist. Dumb obstructionism energizes the cuckoo wing but it’s energized already and is too small to win anything.