Emotional Bleed is shamed and censured for a simple reason.
Integrity.
Everyone here knows they can conjure up an IC plausible justification to do anything they want. Arik wants to go join Waldo and kill his sister. Would he ever do that? No. Could I come up with something that someone would go... Sure -if that's true- that is plausible. You bet your ass.
Since all actions can be given a veneer of IC plausibility that means the infusion of OOC motivation not based on IC circumstances is poison to the game. It's loading the dice. It's not sharing in the same story as everyone else. It's the anti-thesis of roleplay.
If anything can be justified and emotional bleed isn't condemned than how do you tell the difference outside of honest admissions of emotional bleed?
This is of course for the negative sort of emotional bleed. The I want to kill XYZ, I want to punish XYZ, I want to get out of this situation because XYZ.
EDIT - That last question isn't rhetorical.
If anything can be justified and emotional bleed isn't condemned than how do you tell the difference outside of honest admissions of emotional bleed?
^ as people witnessing a story or action or character how do you know if it's emotional bleed or just something you didn't expect to happen?