As gb suggested.
A work colleague was fed up with a neighbour allowing their dog to foul the pavement outside their house. They weren't the type to have a quiet word and collected an amount of the offending mess which they wrapped in newspaper. The newspaper was then placed by the front door of the dog owner and lit. the door bell was rung and colleague departed, promptly, to a safe distance.
What would you do if you opened your door to see a small fire, stamp it out?
Colleague said it didn't stop the fouling, but it made them feel a lot better.
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