leave it out Pooh..............the only reason you might know how to do it, was to stop it?
Leave it out? I've been a grey hat since day one and still remain one. I became one not just to learn how to stop it (I'm not whitehat), but also because I was curious as to how it worked and wanted to learn so I could teach others where tutorials would not suffice.

But if you just noticed someone had broken in your computer you'd be not certain whether (s)he still owns your computer or not despite possible countermesures.
Still don't really agree. If I noticed someone broke into my computer I would look into their steps and see what happened. If they checked out to be fine and just curious/learning, I might notify them via the shell account email they gained off of me that I'm impressed. That level of respect would mean I wouldn't mind letting them keep the bash account so long as their ethical practices remained in line. That isn't a workplace thing, just a personal thing.