It is extremely hard to put yourself in a horrible position like Clyde's but if I were to i think i would enter a state of grief. I wouldn't be able to stand the pain of losing someone i held that dearly in my heart. Of course i would be furious to find out that the real inflictor of the crime was only mildly punished for it.
I would try to contact my lawyer as much as possible for news on the case but i dont think that I would have the intelligence to work out a plan like Clyde Shelton's or the guts to become a vigilante. I would of course be extremely frustrated with the broken court system yet ultimately i think i would be too broken emotionally to be busy trying to punish the felon.
Eventually though i think i would learn how to shut out some of the pain as many other people who have lost someone they loved have learned.
Used as a method of interpreting and sharing said interpretations of literature online.