When dealing with the public, the rule of thumb is "treat everyone like an idiot".
Although the water might only need say 30 seconds at a full boil to be safe, there are some people out there that begin counting the very moment the water is placed on the heat... Unfortunately for the gene pool, the authorities have to consider these unfortunates when issuing instructions. 
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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