I would suggest that if something appears likely to cause a fire, you can:
a) Wait for the fire to start, put it out, then fix the cause.
b) Preemptively fix the cause, thus preventing the fire from occurring in the first place.
The questions are then "how likely is this to cause a fire" and "how bad would the damage be"? I would estimate that the likelihood for authorities to abuse widespread, centralized facial recognition deployments is approximately 100%, and that in many cases the damage would be extremely high.