Hi,
I suffered the tragic loss of my 5 month old Yorkie 2 years ago. He died from ingesting rat poison. I have NO idea how or where he got into rat poison and I have/had my suspicions but nothing was ever confirmed. I had him creamated and have a little wooden urn with his pic on it, and his tiny paw print in clay.
I know the anger you feel from the senseless loss of your baby. I have sooo been there! Its horrible. However, holding onto that anger is only hurting yourself. So I say throw it out there, ask the universe to help you let go of the anger. Say out loud that you forgive the man for what he did. That it was an accident, that you have moved on to better times in your life and you are leaving this tragedy behind. Not your memories of your baby, but the tragedy itself. We will never be able to control or understand the actions of other people. We can only control our own reactions. Your anger and pain is not making any impact on anyone but yourself.
Write this guy a letter, let it all spill out, call him every name in the book, be nasty, angry, rude, condescending... read and re-read your letter.... then put it into your kitchen sink, light it on fire and burn it up. You will feel better getting all your emotions out in a non-destructive way.
You can't change what happened, and you can't change the guys reaction to it. Its up to you to let it go on your own so you don't carry this baggage around with you. Feel bad for the man who cannot be compassionate. He probably has no real joy or love in his life to have taught him the value of a unconditional love.
(((HUGS)))