Thanks for all the nice replies.
I think something might be a bit at odds here between the gameplay that larian has created and the multi-player possibility. They have been talking a lot about poisoning a friend and dueling motivations. In order to have this then yes, a random could steal an apple and grief your game.
I would love to play with like minded players (I tend to roleplay the character within reason). I'll look for a thread to maybe find a couple new friends (I have none that play divinity).
Until then, my steam is
http://steamcommunity.com/id/sluntchop/