The woman in charge of the front lines speaks. Borders walls do work and they also save lives. The border fence along the Yuma border, which was funded wit the help of Hillary Clinton proves this. Border traffic along the fence that was built has decreased illegal border crossing by 90% since the fence was built in 2006 despite agricultural wages being nearly double in some areas of the nation. And it has also reduced crime immensely. Another interesting fact that she points out is that in 2016 alone, the border patrol saved the lives of 4000 illegal aliens that were in severe medical distress trying to cross the border.
It's really simple, no matter how you stand on illegal immigration, if you claim you care about the well being of people being traffiked across the border, you will want a border wall.