He left it open for exploiting so I went in and took a few files.
You couldn't've just said "You should really fix that before someone else finds it and goes nuts"? You had to actually
delete it to make a point?
Your logic here isn't making sense. You're demonstrating behavior that makes you look like a griefer, and that's the only reason I can see for you doing this. You've done several things like this, too.