If a stranger climbed over my fence and set up a tent to camp out in my back yard, I'm not going to assume that they're just going to stay there for a day or two and leave with no harm done. I'm going to call the cops and have them removed. The purity of their motives does not abbrogate my right to privacy.

I don't even want to think about the criminal casing my house who discovers the laxity with which I enforce my property rights in the above scenario.

Tresspassers should be prosecuted. Cyber or otherwise.