Then what alternative steps do you support?
I'm not sold on a wall either, FTR. Not because I think it's a "symbol of hatred" (in fact, that's silly). I'm just not sure the cost/benefit works out for such a thing. But it may well for just finishing off the fencing we currently have in place.
That said, we need to start taking more about what we should do to secure the border. But, sadly, there hasn't been much political will to do that. And that's because I don't think you're right that most people are fine with it...not the ones who matter, anyway.
There is a huge vested interest in keeping the border porous. And don't kid yourself that there isn't. Just because the people who want to keep it that way don't often express that sentiment publicly doesn't mean they don't hold it.