[Laharl]

Whenever anyone says that something is "abstract", first thing I like to do is get a dictionary definition.

American Heritage Dictionary
jus·tice (jsts)

1. The quality of being just; fairness.
2. a. The principle of moral rightness; equity.
b. Conformity to moral rightness in action or attitude; righteousness.
3. a. The upholding of what is just, especially fair treatment and due reward in accordance with honor, standards, or law.
b. Law. The administration and procedure of law.
4. Conformity to truth, fact, or sound reason: The overcharged customer was angry, and with justice.
5. Abbr. J. Law.
a. A judge.
b. A justice of the peace.

So yes, basically, emotion is attatched to justice. It's a concept that is defined by morality, and morality means something completely different to any and everyone because personal morality is dictated by what we consciously think but most often simply FEEL is the correct way to be.