Just

"He who sheds human blood, humans will his blood be shed" (Genesis 9:6).  "He who would shed human blood" is not only about punishment but prevention as the sacred text means only if there is no other way to stop the potential murder. -Sanhedrin 72b

Our task is ultimately about justice, not revenge.  While we may be angry to the point of fury, we must never lose sight of the sacred call to justice.