We know ourselves best
When, as a helper, aid worker or emergency services professional, you yourself are involved or affected by a critical incident at work, it is often hard to explain to your direct environment how this has impacted you. It is often possible that you don't even understand yourself what is going on and why you react the way you do.
From an organizational perspective, the person who may understand you best, is a trusted colleague who has "been there-done that". It may be someone from your own team or someone working in the same job as you, someone who knows what it is like to go through what you are going through, someone whounderstands the consequences, someone who can relate to your reactions, someone who can support you while you may have to go through a process of paperwork and investigation, someone who can explain to your family why you are not yourself lately, someone whom you don't need to tell how you feel, because (s)he already knows from experience......
The perspective of the CISM model is that many social and emotional problems in the aftermath of a work related critical incident, arise due to a lack of support and understanding from the organization and can be prevented by early intervention.