The behavior is wrong. Indeed, past a certain level, it is a crime. That is, if it happened the way it's actually true:
In the early evening of September 15, a concerned citizen notified a city official of three people driving an unmarked vehicle with California state license plates. The team of people were going door to door claiming to be conducting a covid-19 survey and tests. The city was not notified prior to the team’s arrival, and we felt there was a need to follow up on the situation. A city official and two other residents met the covid-19 team to verify their identification. Two vehicles driven by the city official and residents were parked on either side of the Covid-19 team’s vehicle, but it was never blocked. The city official asked the Covid-19 team for identification, which was presented. Out of an abundance of caution, the Houston County Sheriff’s Department was also contacted to verify the team’s presence in the city. The Sheriff’s department did state that the vehicle was supposed to be marked, but they confirmed the team was part of the Department of Health. After properly identifying the team, they were left to continue conducting their research within the city. We would like to make it clear there was never a gun or any weapon present and no threats or aggressive behavior occurred during the interaction between the city members and the covid-19 team. We can only assume that the team misinterpreted a large fire department communication radio in a holster for a firearm.
I don't know about you, but I'd be very skeptical about someone coming up to my residence stating they were with a state agency in a car with California plates.
It would be a truly deplorable incident if it happened as the OP says it happened. There's evidence that it did not happen that way.