...that's actually a fascinating way of viewing it. It's true that much of the damage done by magic and the supernatural in my world is caused by human error, mistakes, or folly. I suppose it can't be said that it's the leprechaun's fault that people accept their blessings and ignore the risks involved.

Rather like the myth of the monkey's paw.

From the sounds of it, you have a few names you can start with.