You will suffer loss of concentration and common sense. What you have left, your family and friends, will hurt too and they will suffer even more if anger isn't vented into a positive way. So what could be positive about anger. And see all the good they have done and the laws they have influenced. How about all the Suicide Prevention groups, and the groups to help people deal with Depression.
Good things can happen from bad events.
In business we are told to develop multiple streams of income . Dealing with Grief or being a survivor . As an example, Elvis Presley has a fan club that continues to memorialized him in their daily activities. My child is more important to me than Elvis . I won't feel guilty doing any project that helps me remember Jared.