The main reason we need a barrier on the southern border is to stop the migrant hoardes if/when central and south america really get chaotic and tens of millions come in waves of inhumanity. There needs to be a way to funnel them into certain areas of control. I know it sucks that they can just pass drugs through the fence but they could almost as easily throw them over a wall. And border security and military have always said they want to be able to see through. Makes it easier to gas them too. Let's get the rebar fence up first. Can always add cement later if necessary.