When considering final grades for students near a particular cutoff you will hear statements such as:
"He got 48 % but he handed in all the assignments and worked really hard. We should bump him up to 50% so he can pass".
"She got 78% but she asked lots of good questions in class so we should bump her up to 80% and give her an A."This seems reasonable and compassionate. However, if you said something like the following, people might say you were being harsh and unfair.
"She got 80% but talking to her showed she really had a superficial understanding and just crammed for the exam. We should bump her down to 79% and give her a B."
"He got 51% but skipped most of the lectures and appeared not to do much work. We should bump him down to 49% and fail him."If we were consistent we would be willing to consider such arguments.
Bumping should go both ways.
I can think of one related exception to this. At my university, students can make a formal application for regrading of a piece of assessment. If this occurs it is done by another faculty member and they must accept the new grade if it is lower. Sometimes it is. I think like this.