How is it stupidity and nonsense?
It's exactly what's going to happen and you know it.
But I am curious. Is it stupid to think that will happen or to fear the consequences or what? Or can you even explain a viewport that's half logical on the matter.?
Nope it's stupid to believe any kind of wall will solve the problem.
I don't understand strong nationalists like you. You don't want any kind of illegal in the country? Just give the right to militaries at the border to shoot at sight anyone in the noman's land.
Wall is a hybrid useless tool. The only thing you'll achieve is that you'll ONLY get the worst of the neighbooring country, the women and children will no longer be able to go through so you'll get only the young men you fear the invasion of.
Don't want any illegal immigration? You got two solutions, either automatic legal migration (regularization on everyone with really easy conditions) which would be the "socialist" solution, or just shoot at sight (which would be the nationist focus solution). Anything in between is useless complicated stuff that will only provide poor results and high costs.
And don't think I'm making fun of the nationalis focus solution, it would be a very efficient one. Not the one getting my vote but it's a good solution.