Some individuals it seems to be their favourite way of communication. Often its overzealous people that are trying to stand ground.
Aibu to think they just don't achieve anything? Even when someone does make a mistake I would never dream of copying in countless people and having a go at them to publicly shame. What I find best is a quiet private word and giving knowledge as mostly it's due to lack of understanding.
Sending a patronising email ofen makes the sender look silly, especially when it turns out they are wrong or was caused by them. Finding blame rather than improving processes seems to be very popular.