Correct, and the hypothetical establishes that the proportion of maliciously false calls is essential for determining the reasonableness of the policy. At 0% maliciously false calls, reasonable. At 90% maliciously false calls, unreasonable. Clearly, that number is important to the discussion, which is the sole point of introducing the hypothetical.
Thank you for explaining this so clearly.
This is a repeat of the same argument. An unrealistic hypothetical does not establish that we need to consider something in the real world. Hypothetically perhaps UFO's were beaming ideas into the cops' heads, hence we cannot trust their statements and need an alternative data source. Nope, this is preposterous so we can go ahead and not worry about concerns based solely on this argument.