You fail to understand. Sure, if they might be able to hit a few factories. But it will have no effective impact, because China has tens of thousands of factories, and any factories hit will be up and running again within days. Any commander that wastes precious munitions will be sacked for incompetence. The US military would need to utilize all effective fires to destroy Chinese military capabilities, not waste missiles on random factories. The US is at a disadvantage in terms of available fires, strategic depth, and logistics, therefore it cannot waste its available fires on targets that would not impact the military outcome. You simply have no grasp of neither scale nor military strategy.