Memnoch,
Spot on, you can only give someone so many chances. I think you handle these things really well, it probably helps that you don't enjoy it. I know that sounds odd, but you are more likely to think it through and weigh up the possibities beforehand, so you don't make rash decisions.
Also you are very clear at explaining to people what they shouldn't do and why they shouldn't do it. If they then ignore you, they have no excuse.
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Time is an illusion. Lunchtime doubly so.
Epona of The Laughing Hyenas