What an absurd argument! Because no other nation has this or does that, then we should or shouldn't do it or have it ourselves?
My point is that there are very few walls because most people do not want them. When a problem arises, then it may be a necessary evil to build a wall which is OK by me.
Israel has a serious problem and found a wall to be a practical solution.
But for the most part, most countries do not build walls.