Up above, you commented that vengeance felt good for a while, but that ultimately, only forgiveness would soothe the victims' families.
Since vengeance does therefore seem to be of some benefit, the murder victims' loved ones would be best served by first seeing the killers executed, then forgiving them in time.
Well, I guess that's one way of looking at it. Haven't ever heard that one before. But, yes, you always want to see these poor people able to forgive since you know if they do that they'll eventually be OK.