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Those jobs exist in the police force and I would be very surprised if most countries didn't have something like what you describe.
But even the police can be ethically problematic in a way that the fire service isn't. It is debatable if all laws are worthy of enforcement. The fire service (and related, disaster mitigation services etc.) does not really have such dilemmas, I think they clearly accumulate so much positive karma that even if some aspects of their acitvities are questionable they are still having a very positive sum.