Odd that you would cite Israel. The go to place internationally for border security. North Korea and China are ramping up their border security. North Korea to keep them in, China to keep them out. In neither case are crossers welcomed, quite the contrary.
Somehow they make it tho, and so do supplies. Trade marches on.
They? If our number of illegal border crossings totaled N Korea's and Israel's together, there would be little to no issue. Would not even be necessary to adopt their penalties, LOL. You are aware of course, mass illegal immigration to N. Korea is not a problem. Black marketeering would be a totally different issue/subject
They being the migrants and the traffickers. No laws or walls can ever stop the flow of goods and services.
Maybe we should adopt/make reciprocal Mexico's enlightened immigration policies? As to flow of goods and services, one can limit it, your cited Israel has done a remarkable job on all fronts you have mentioned.
They have their own tunnels.
Of course, I doubt anyone can guarantee 100% security, but to say security is a useless exercise for that reason is nonsense.
I would say that restricting trade and travel is against Natural Law.
Would be your prerogative.
The facts speak for themselves.
Correlations for most anything can be found if you look for them, does not establish fact(s).
It isn't correlations they are talking about, it is predictive power. Restricted trade leads to war, while vigorous trade prevents it.
All reliant on their correlations of past history. Hell, one could show causation(s) from anything if so inclined. Of course integrated trade would be a factor, and less of incentive, that's a no-brainer. But to state it's a barrier is misleading. Is/was trade relevant to ISIS, was it to Hitler, Castro, Stalin, Mao, Ho Chi Minh, et al. In some cases trade may have became a later issue , but not the reason(s) for the initial aggression(s). Ownership, plain and simple would most obvious be the greater incentive, not trade imbalance.
Yes, trade was extremely important to those people, and economic issues are what most people attribute the rise of Nazism and the fall of Communism to.