In a story that hits close to home for me. We all need to quit shaming and blaming. None of us are perfect parents, we are all just trying to do the best we can.
The best words have been said by Melissa Fenton in her blog post An Open Letter to Perfect Parents.
Through My Mistakes 
This story has absolutely sickened me. I have cried too many tears because it is a parent’s absolutely worst nightmare–a nightmare you couldn’t even have imagined because of how horrendous it is. And to have people type behind the protection of their computers about “no swimming” signs sickens me. SICKENS ME. I want to envelop these parents in a cloud of love and ease their pain in some way. When did we lose our empathy? I am so unbelievably heartbroken over this and can’t imagine why anyone would feel the need to say anything that promotes any other emotion beside “I’m sorry for your loss and let me grieve with you.”
Exactly all of what you said. I cannot even fathom what they witnessed, what they are feeling, and the images that can never be erased from their minds. This is a good family that is now walking through a personal hell that no one will ever understand.