A little harsh, I don't think you could imagine for a second what you would do in such a situation. You wouldn't physically be able to look 24/7 and you can protest that you would until you're blue in the face but I won't believe it.
That girl who's boyfriend got killed in Australia didn't behave in the way grief stricken people are 'meant' to behave and she ended up accused of murder which it sounds to me like you are now accusing these people of. Perhaps if you send them a template of how to behave when you are out of your mind with grief, worry, regret and fear, they can avoid these accusations from others.