In all seriousness...
My second wife was raped by a "friend" of hers.
A very good friend of mine from the 'Corps was murdered by drug dealers when he confronted them to get his little sister out of the lifestyle.
The Swede I was engaged to had been raped by her previous boyfriend and he continued to harass her while we were together.
While I was in the Marines my mother married a man who became physically abusive, to the point he put her in the hospital.
---I tend to not hold grudges. The five year rule gives me enough time to remove myself emotionally from the situation and view it from a more objective standpoint.
How would my vigilante actions affect the people around me?...especially loved ones (family/friends etc)? After five years without exception I've been of the mindset that being there for the people I care about is more important than extracting vengence against some dirtbag. My being present in their lives (or the lives of those they left behind) is far more valuable.
Removing the scumbags from society won't bring my friends back and it won't heal the emotional scars carried by those that I've loved. In the end people do tend to reap what they sow and those types of individuals typically meet a nasty fate or end up in prison without any help from me.
So in the end the five year rule primarily acts as a cooling down period for me.
It would take quite a bit for me to still feel it was necessary to kill someone after that period of time. The only likely reason for me to pursue them at that point would be if I felt they were still a threat to my loved ones or society at large and that the legal system was unable or unwilling to properly control them.
---People tend to misunderstand what I mean by the "five year rule". It doesn't mean that I spend five years plotting to get someone back for whatever wrongs I feel they have performed. It's actually more of the opposite, it forces me to keep from acting out of a highly emotional state.