I am a dad, and I saw a change in my wife the DAY my first son was born. It's easy to forget but we were all on the other side of having children at some point (regardless of gender). It's something that changes you, your relationships, your priorities.
If someone accidentally killed my child I don't know that I'd forgive them either. I know that it would tear my family apart and would ruin the rest of my life. I hope it doesn't happen to anyone.