Communicating with stakeholders
Once your attempted communications are created and leave your control, they are now out there for others to interpret and act on. The first rule of interacting with a customer is to state only facts. Do not attempt to change the appearance of a situation or finding to be better or worse than it is. If you do not know why something happened, do not pretend you do. Unless you saw a person at a keyboard performing malicious activities, then you do not know who was performing those actions even if it was their account. Threat hunters and red teams have caused personnel to lose jobs over misrepresentation and poor communication of facts. Stick to the facts.
When it inevitably happens that someone asks for an opinion, minimize the response if it cannot be avoided altogether. A hunt team is there to give the facts not to state someone's motives or whether it was a specific individual that performed an action. Anytime an opinion or assumption is communicated...