This is the dumbest argument. "It won't stop thaaaammm!!!!!"
You do know you can make that argument for all the measures we take to preserve our sovereignty. I mean, prisoners escape, illegal aliens sneak by agents all the time, etc. Even North Korea's border has people illegally cross it, and the deterrent there is a bullet.
No deterrent is or security measure is 100% foolproof. But, your logic can apply to them all. Therefore, we should have no security measures.
"Bullets won't stop thaaaaaammm!"
I wonder if people really believe their argument opining a wall won't help ("work").