I have always written myself up whether it is a med error or incident occuring with a patient which is not a med error.
I recall a nurse educator stating during orientation . I would rather have someone report themselves " I know then I can trust them, as opposed to the person who never will ,nor admits they are capable of mistakes" guess we all make mistakes whether it is a system type error due to patient work load or what ever the case might be.
I believe we all recognize when we have made a mistake and try to own it.

I have sometimes learnt best by the mistakes I have made myself .