Final answer:
Critics argue that many industries can claim they make contributions to national security and deserve protection, weakening the argument for protective tariffs based on military self-sufficiency.
Step-by-step explanation:
According to critics, a flaw in the military self-sufficiency argument for protective tariffs is that many industries can claim they make contributions to national security and deserve protection.
This means that if the argument is accepted, nearly any industry can demand protection, making it difficult to determine which industries are truly critical to national security. For example, industries involved in producing non-essential goods could argue that protecting their products is essential for national security, which weakens the argument for protectionism based on military self-sufficiency.