I'm for the wall because I have family and friends who live and work at the bottom. I genuinely feel sorry for those at the bottom in the US. I read the negative messages on here about the wall and ask myself if I'm on the right side of this issue, but I can't ignore what I've seen and heard from family and friends. I'm all over the map on this topic as a witness too, I've lived in California where many immigrants live, my wife is an immigrant and has only lived in the US 10 years, and I've already mentioned many of my family and friends are working retail, construction, trucking driving jobs. They merely want to make a living wage and live in reasonably good housing, but they compete with people willing to work for very low wages and willing to live far below US standards just to survive in the US because life in the US is orderly compared to their homeland. Many immigrates don't have degrees and aren't working at Google, but more often not very educated (again, I'm a witness to this), when petitioned, they are allowed into the US so there is a large supply of labor at the bottom that keeps wages down. I lived in CA for 12 years, but I'm from MD and I currently live a few minutes outside Baltimore. Not only do I think too much immigration hurts all people at the bottom, but I think it doubly hurts blacks. "The rate for Blacks or African Americans was 6.2 percent, down by 1.1 percentage points from the October 2017 rate. The rate for people of Hispanic or Latino ethnicity was 4.4 percent in October 2018."*
The repubs were once viewed as aligning with business so bring on the immigrates to fuel corporations with cheap labor was the thinking. That truly was how repubs were viewed and a google search could easily provide quotes from dems stating exactly that while dems spoke up for working conditions and protecting wages. While the repub establishment can't claim they've cared much about workers, I see dems as caring a lot less than they once did. DJT has turned the repubs upside down so it is hard to say what direction repubs will go after DJT is gone - they could double down on aligning with workers hoping to take electoral college votes from all the states DJT won in 2016 - that might be their strategy going forward.
There are plenty of dems that made very bold anti-illegal immigrant statements prior to when DJT was elected. I keep thinking their opposition to the wall is purely to oppose DJT no matter what he does since no matter what you think of DJT, he surely has upset the status quo in D.C. for both repubs and dems. It is a corrupt city, corrupt to its core.
BTW Cesar Chavez, a labor union icon, opposed illegal immigrants and supported restricting immigration, because he thought immigrants weakened unions and kept wages low. Illegal immigrants were used by farmers as strikebreakers. Chavez knew a large supply of labor would weak the demand so affecting wages and more. Chavez was a dem, dems marched and protested with him. I can't forget this.
All of my support for the wall, is based on my support for workers at the bottom who already live in the US. I'm for the people already here even if they are illegal. I simply feel we need a wall or a steel barrier to slow down arrivals by making it more difficult to cross. Employ cameras and drones too, no problem, but I feel those things are simply identifying people who have already crossed. Once they have crossed, it is difficult to return them it seems so first line of defense has to give those trying to enter a challenge physically.
I want corporations to be starving for labor even if prices increase. I want workers so powerful by there being fewer of them. I want labor to be so low that corporations must develop their own training programs as well fund high school training programs. I want American workers so rich that they'll decide to have more kids. I want labor to be so strong corporations will provide free health care and onsite childcare. I want corporations to be slaves to labor rather than labor being slaves to corporations.
*https://www.bls.gov/opub/ted/2018/unemployment-rate-2-point-7-percent-for-people-ages-45-to-54-8-point-3-percent-for-ages-16-to-24-in-october-2018.htm