And therefore, is not something to see as immoral or feckless?
As in, if somebody forgets something, they didn't purposefully do this. You can't choose what you forget or not, it's just something that happens.
Like accidents, there is a degree of responsibility in that you can take steps to make something less likely to be forgotten e.g. writing a note, setting a phone reminder.
But most of the time it's not the person's fault, it's just something unintentional, and therefore you shouldn't get angry with somebody for forgetting something.
If I am NBU, why do people get so angry about forgotten things/events/tasks? Are they oversubscribing to the idea that it's possible to take responsibility? Or do they assume it's an excuse ie the person just couldn't be bothered to do the thing and lied and said they forgot?
Or can most people choose to remember certain things, and so the act of forgetting means that you didn't make this choice and is therefore an actual marker that you don't care about the thing?
(Full disclaimer, I have ADHD and I am wondering how NT people's brains work.)