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I'm very straight forward about these kinds of things, it usually seems to work. I'd go with, "We know you've engaged in some petty theft, we aren't debating your guilt, we know that you have taken certain things from us. Stop taking thing or there will be consequences." If they wanted to engage in further discussion I would tell the person they have to leave now but they will be welcome back tomorrow. If they want to debate, tell them they have to leave. Personally I'd get rid of a petty thief that engages in strange social behavior, it probably won't end well.