The problem is the REASON we have those rules ( other than to keep the numbers manageable) is so that as much as possible we can check the motives of the people coming here. Are they really coming here seeking peace and shelter or is that a cover in other words. If they come over here illegally and are caught in the act of doing so then one could argue that stand your ground applies. In many states a homeowner may use lethal force on someone trying to get in ( even if that person has no ill intent) Now, not all homeowners ( even those with firearms will choose to do that, but it is lawful to do so in many states. Now, it is different if say someone comes here illegally commits a NON_VIOENT crime is later caught ( that person may still be deported, but would not have lethal force used on them, but if you are caught coming over here and not doing it the right way there we have the right to protect ourselves and if lethal force needs to be used so be it.
You don't seem to see the problem that I am talking about though. I am not disagreeing with what you have said is the real problem ("to check the motives of the people coming in") - I am only saying that the method of enforcement (shooting at them) is immoral and
evil when the wall is a completely harmless way to achieve the same effect.
The real problem that I am saying, is
the need to use force, and I am specifically saying that a wall is morally more righteous than the use of rubber bullets.
But my greatest emphasis is my concern that the leader of the world's most prominent superpower is, in absence of the wall, being forced to enact violence against people.2
The wall saves the leader from becoming violent altogether, when you can see that violence is not appropriate.
If you like analogies, think of it this way: you are walking down the street and you see a nice flower on a bush that hangs over the fence - so you pluck it and tuck it above your ear. Now think, if the flower was inside the boundary line - then you would have to reach over into transgression because it is clearly defined as another person's property (in other words, it is not an article in the public domain, but it is private property - it would be theft). But humans are so attracted to the things they like that they do transgression on occasion, so there is some likelihood that they may still reach over the boundary and take the flower. Now, if there was a fence that was sufficient of a nuisance that they ultimately decided to not go to all that trouble, then they would have not gone over the fence to take the flower.
That shows the value of a fence for the purpose of security - it is only a deterrent that is sufficient to prevent the transgression.
What you are suggesting though, is that the house owner should have the right to use violence as a deterrent instead of a fence. Now think about it this way too, that the fence is only going to cost the home owner $40, but he would rather not build the fence, he would rather use violence because in his mind, he is justified to do violence against the transgressor. For whatever reasons, he doesn't want to put the fence there, and he is happy to use violence against a person if they happen to reach over and pluck his flower.
In that way, I say that the fence is a moral solution to the problem, and that it is sinful in a number of ways, and a disproportionate use of violence as a means of law enforcement.
I am sure that if I was the presiding leader of USA, I also would rather there was a wall that reduced the need for me to do harm to people, and that forced them to enter through the appropriate screening gates.