A side of me wants to punish them right off the bat if I’m being honest because their behavior portrays to me that it is most likely true that they had Mass RDMed. On the other hand, I would like to try to reason with them. You'd never know the full extent of the situation you or the person are in. For all you know, they could be having a bad day, so they might act that way out of frustration, although they shouldn’t be acting like that to begin with. I would try to approach them while still maintaining my composure, try to reason with them, and if they continuously illustrate irrational behavior, I will just review the logs, and depending on the situation, I will bring witnesses(the victims), and if they all testify against him with the same/similar story, then I will punish the suspect appropriately according to the staff handbook.