The tone of the sentence is critical and urgent, pointing out negligence by the county government.
Critical is the best description of the tone of the introductory sentence. The writer is expressing a sense of urgency and importance, pointing out a neglectful behavior by the county government.
The use of words like 'neglectfully ignored' and 'must enact... immediately' shows a critical tone towards the government's inaction.
This tone aligns with the purpose of an argumentative essay, which aims to assert a debatable position firmly and persuade readers to accept a new idea or action.
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