If I had a neighbor come on to my property, take something apart like a lamp and provide me a letter admitting to it; the cops would be called. That he repeatedly did it and sent self satisfying emails is icing on the cake. What if he left live wires exposed? The guy took liberties he was not entitled to, and he's being a **** about it, too. Not a difficult call at all.
Yeah, that was kind of my point as well. No one just talks to their neighbors anymore. No one said you have to be best friends, but enough that they should just ask to turn the light down or off, not come over and start dicking with ****.