REVENGE!

I think revenge is okay some of the time. If getting revenge is hurting or killing someone, then it's not okay. If revenge is winning a football game against the team that beat you out of moving on in playoffs the year before, then revenge is sweet. Sweet, sweet revenge!
I think Mr. More is right about revenge. "Those who plot the destruction of others often perish in the attempt." If someone is killing someone else to get revenge, they are the ones who would be going to jail. If convicted of murder, they'll probably serve for life, therefore perishing in their attempt. In other words revenge can be a good thing, or a bad thing, it just depends on what the revenge is being used for.