You are asking why save Intel of all chip manufacturers, and the answer is because there aren't any other major chip manufacturers in the US.
AMD no longer has a fab. TSMC dominates the global market and basically has no competition.
In the event that Taiwan is invaded, the US would suddenly have a huge problem getting access to any kind of high end chips, be they CPUs or GPUs. This would be a major problem economically and militarily for the US.
Some caveats: Due to the chip act, TSMC does now have fabs Arizona, though I'm not sure what their capacity is. TI, and some others building lower end components also have fabs I believe. For x86, high end ARM, and GPU's, virtually all of that is manufactured by TSMC right now, mostly in Taiwan.