It was a 'protest' song which reflected the era of the 1970's which was a time of unrest and upheaval in Britain and across the globe. I think Cliff's 'dad dance' of it in Eurovision probably added to the sense of uncertainty and unpredictability.
After all, we do it to out pets just in case they run away or get stolen.
Human chips would mean we don't need passports, driving licenses or birth certifcates as this information would be loaded onto the chip.
Criminal records and outstanding warrants would quickly identify criminals and...