It is revenge only when a family member of the victim kills the murderer.
Violence has both vertical and horizontal classifications.
We have exclusions, like insanity check up, defensive attacks.
Lonius - A common human being understands the difference and your statement "nourishes the seeds of violence that exist within each of us" is not accurate.

"Some of us" may be accurate but just "us" taking everyone into your thought is not accurate.

Just here in QL 2/7 is the ratio. So "us" makes no sense.

Not only grownup even a kid can differentiate "Crime" and "Punishment" easily as long as he has a good brain.