If a man comes and asks for work it isn't my duty to query him or her on any subject that does not affect his ability to do the job.
As an appreciative native citizen of the United States I have a lot of compassion for people who were born and required to live under a government that is even more corrupt than the one that currently runs the United States.
I cannot support a "Berlin Wall" in Texas.
If a government cannot assure an opportunity for it's citizens to aspire to a decent life then it is illegitimate, incompetent,and corrupt. This is the condition in most of the world.
I could support "Regime Change" for Mexico and much of the Americas. We have done so well with it in Viet-Nam, Afghanistan and Iraq.
The United States immigration problem is caused by failing, or failed government policies in the U.S., Mexico, Cuba, and others. It certainly is not the fault of the person who is forced to leave friends, family, and familiarity to seek his livelihood someplace else
Personally I think that Mr.Guillotines invention does not suffer from overuse. Violation of the public trust is probably the most serious offense against humanity. It is being violated in almost every country in the world today.