You may want to re-evaluate your opinion. The "tracking microchip" conspiracies mostly stem from tracking chips (dumb RFID) used to tag wildlife.
These people don't know how the technology works, but they do know that we tag and track animals. They're not wrong that we use microchips in this fashion.
I'm assuming you are talking about ARGOS tags (more sophisticated tag that actually transmits GPS (last comment was talking about pet tags (which are RFID)), but it's FAR from microscope / injectable via needle. I get it, people's lack of understanding about technology is what fuels the conspiracy theories. They don't realize that no company NEEDS to track them as they have already traded all of that information away years ago.
I have some close friends that subscribe to such theories and no amount of tech discussion will convince them otherwise.
These people don't know how the technology works, but they do know that we tag and track animals. They're not wrong that we use microchips in this fashion.