Commandment 6 thou shall not murder

There are no ifs in this commandment, no excuses and no exceptions. God did not give excuses for why you could commit such an act. I have seen people able to walk in forgiveness for horrible murders and asked If someone killed my child would I, could I forgive ? There is nothing, not a long prison sentence, not even a death sentence that will bring back a loved one that is murdered. Sticks and stones will break your bones but words will never hurt you rings in my ears , I know this isnt true to a point but literally being called a name is a sad excuse for the taking of a life, in fact it is the most pathetic thing I have ever heard. Think if we were able to act this way how many times would you be dead already ? I would have died a thousand deaths.... I can only grasp at the commandments and the promise from God that says vengeance is mine saith the Lord I WILL REPAY..