Don't leave over something so silly...After awhile you may realize all of that stuff can be made much better like another said.
I know a friend of mine shares the account KangarooMan, he is computer illiterate so I'm 100% sure it wasn't him.
But, yeah, I've had lots of my own work deleted once before also..Lots of levels, and articles I've written, all because I was careless. Let this be a lesson to you, whenever an athlete makes a mistake, they go back and work on what happened and fix the problem. Just go back continue to have your fun and be a bit more cautious.