I think your post sums up your worries pretty well, can you tell your T what you told us? If someone did run his plates to get his address and then turn up at his house...I suppose it would turn in to a police matter for stalking or something. Just knowing where he lives doesn’t seem like it should be a problem? I know where mine lives, he’s shown me pictures of his house and garden too. My therapist isn’t afraid of people knowing things about him (I’ve asked him before) and I would never hurt him, but if I turned up at his house I don’t think he would want to see me ever again.

Also I have seen some therapists for sessions in the house they live in...with their wives and family in the building. I do not recommend this as it sucks but knowing where they live must not matter to them.