I prefer reason over paranoia.You've just cited two ways in which your personal flight data could become public without your consent... and we haven't even see the RID software yet. If your computer can be hacked by a skilled 6th grader, or your car's fob can be hacked easily, you can bet it wouldn't take much to for an ambitious person to develop a tool for those who would love to invade your privacy.
You mark my words, this RID stuff is only the proverbial Canary in the coal mine. I wonder what George Orwell would be writing today were he still alive.
There is no personal information (except location) being sent out via RID package elements. There is no way for anyone to find that info via RID information. Period. It's not tied to the FAA data base.