Fair, but first I'd want to ask if you understand why illegal immigration is a bad thing. Do you understand why no civilized country just lets unrestricted numbers of people come in anonymously? Did you know how much crime is committed by unvetted illegal immigrants? Or how large a percentage of federal prisoners are non-citizens? What about the importance of vetting immigrants for disease?

Do you know what would happen in the opposite case, if you were caught illegally residing in Mexico (and rightfully so)? Why should it be different in the US's case? Clearly Mexico understands all these issues I've mentioned, so I do not see why they would escalate tensions, or even if so, why that outweighs the cost of open borders.