I would support a fence over a wall and in certain locations only. I do not support a complete border wall.
#1 It is very expensive
#2 It won't be that big a deterrent. IIRC something like half of all illegal aliens just overstay their visas. The wall would do nothing to stop them. Then you have the tunnel systems, and what are those things called? Oh yeah, LADDERS.
Even the claim that Mexico will pay for the wall through tariffs is much more complicated. It isn't a black and white thing we can just switch on without sending ripples through our economy and theirs. If their economy gets hurt then you will have even more people wanting to cross the border for example. Could it theoretically be done? Maybe but at a number of consequences , some of which may affect using ways we cannot predict.
Your lack of logic is unbelievable!
To say we don't need a complete border because it's expensive is like saying you only want to pay for 2 tires on a new car. If you aren't going to secure the entire border, then securing parts is not secure anything.
Also, to say it won't deter visa overstays, so don't build it, is like saying penicillin will only treat one of the infections you have right now, but not all, so let's not give you any.penicillin.
The problem of illegal aliens is multifaceted. One solution is not going to solve all facets. Arguing against one measure because it won't stop them all is just ignorant.
Finally, tunnels, ladders, and anything else that is a common method of circumventing a border can be countered. Your comment is rather juvenile. If you can't imagine better than that, then explaining things is a waste of time.