Passage Summary: If something is bad for people and anyone can buy it, the government should slap a massive tax on it so people stop using it.

Reasoning: The principle establishes that if a substance is harmful and available to the public, it should be taxed at a rate high enough to deter its use.

Analysis: This is a straightforward conditional rule: if a substance meets the criteria of being 'harmful' and 'publicly available,' then a specific action—taxing to discourage use—is required. When looking for an application, ensure the substance in the answer choice is explicitly described as harmful and accessible to the general public. If the tax mentioned doesn't actually aim to reduce consumption, or if the substance isn't harmful, it won't fit the politician's criteria. It's a 'sin tax' logic applied strictly to public health and safety.