My position is that this should never have been necessary, since I am sure that the Founding Fathers never envisioned an America of such poverty of Common-sense as to apply it to casual travelers, illegal criminals, indeed enemy spy moles hiding within a family.
If there are any rational arguments against this clarification, I have never seen any, nor heard of them.
You are so right...the very reality of the Founding Fathers and nearly everyone prior to 1900 or thereabouts never imagined airplanes (much less used as flying buses as they are today by the general public), giant ships with huge carrying capacity, people crossing the Gulf on rafts, flooding by scurilous method across from Mexico beyond the straggling bank robber running from the law...
There are many sincere concepts in our Constitution that do not take into consideration today's "poverty of common sense" in many areas of contemporary behaviors.
I'd be willing to bet money on the fact that if and when any of those responsible for the 14th Amendment could be accessed today, they'd identify the current massive influx of illegal aliens as representing a foreign, invading force or something very close. They certainly would not be cheering it on. Nor looking to rationalize the damages done and dangers inherent to the problem. They'd be resorting to firm and immediate legislation to stop the problem in it's tracks.