Mostly agreed. However I view the matter a bit differently. Being able to be self sufficient is a pipe dream. Heck ever since the beginning of the bronze age self sufficiency has never happened again in human history. However more evenly balancing out the supply chain is a far more achievable/desirable goal. If tomorrow a war or natural disaster disrupted trade or production to SK and the ROC, then the rest of the world would be almost totally without leading edge DRAM, NAND, and logic chips (to say nothing of the good bit of the world's trailing capacity also becoming unavailable). If instead say 40%+ of that capacity came from the NA/EU/SE Asia/JP, then instead of a total breakdown in the modern world, you could just have massive shortages. Critical ICs for society's most important products could continue to be made (as well as smaller volumes of the products people would want but don't need). This would also allow for the path to recovery to be accelerated, after all it is much faster/cheaper to expand existing sites in the West/JP/SE Asia than to build new greenfield sites (as well as the obvious fact of having a smaller production shortfall in this scenario).
In their defence it isn't their job to know. You and I are probably just as clueless about the law, accounting, designing a good aircraft, detective work, or writing an award winning novel as they are semis. Even within our niches we have different knowledge. Assuming you are on the design side I couldn't tell you anything beyond architecturals details you would have learned in computer ENG 201/301. On the other hand you would probably be hard pressed to tell me anything about the rate of adsorption of etchants to the wafer surface and then use this to create a model for the etch rate for a given process. People generally tend to know what they need for their daily lives and not much more.