Take it as a good thing. A surprising amount of "script kiddies" are doing this for your own good. They didn't take down your site with immense damage, and they could have. Easily. Some will even put their email and how to contact them.. I've actually heard of them responding and telling the person how they got in, and how to prevent it.
It's a pain in the neck, of course.. and we would all like a heads up email over the defacement of our sites.. but then again, would we listen to emails or just ignore them? Sometimes it takes something like this to grab our attention and do something about it..
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