The original Kingsman movie was about a tech billionaire who planned to use cellular telephones to kill off a large part of the population.
Movies and TV series about pandemics.
My bet is that those that are vaccinated are now susceptible to attack from chemical, microwave RF and biological agents. They are however proven to be compliant and easily duped. Chances are the next round of 'crisis' will harm th eunvaccinated first to drive more to vaccination. Once vaccinated they can be chosen and targetted for death or slavery as groups (China researched biologicals that killed certain races more prolifically than others.)