Yeah I've been playing it for the last week or so (Now that Notch has fixed the code so that IT ACTUALLY WORKS without crashing within two minutes on my computer) and I can see how someone would want to be done with it. And how griefing would be massively heartbreaking, I've spent ages lovingly crafting some ty little house, I'd be buttsore in the extreme if someone trolled me and destroyed it.

Single-player for the win.