What is clear is that the VS crew felt an evacuation and not a disembarkation was required
As yet, we do not have sufficient information to know whether this was a Flight Crew initiated evacuation or a Flight Attendant initiated evacuation (or for that matter, a passenger). Right now, nothing is clear.
It is reasonable to ask questions about the decision to evacuate once the full circumstances have been established, in the expectation of applying the lessons learned, should there be any.