Decredenza,
Self imposed pressure is probably the most difficult to deal with and the most dangerous.And,the further you are into the task at hand (i.e patient already on board,last load of the day,returning home with the boss on board etc) the tougher it gets to turn the bus around.
By definition "self imposed" implies "not applied externally".I have seen my own company use that phrase often to cover their asses.
"We have never pressured anyone to fly in those conditions,infact we have rules to prevent them from doing it,after all, safety is our number one priority.This was a case of self imposed pressure."
See what I mean?
Alt3.