Dear Thieving Asshole,
I could understand that you might need my rear light to put on your cool bike, so that you won't get hit riding
Although the light was basically free for the taking, I wonder why it was necessary to destroy my seat bag by ripping it to remove the light. Did you almost get caught? I actually don't mind that much that the light was taken -- I probably would have given it to you if you had convinced me that you needed it for your bike. You could have easily slipped that light off without damging the bag. Please try to be more considerate when stealing my shit. As you can see, I was barely inconvenienced by the loss of the light, Nick helped me to bolt the new one onto the bike, for lack of a better place. Please try not to hurt yourself attempting to steal the new one. I don't want to be subjected to a personal injury suit.
P.S. If you try to sell it back to me on the street tomorrow, I'll do my best to steal it back from you without damaging your hand.