The public needs to see graphic imagery of humans causing other humans to suffer. We need to know the harm we inflict and we need to turn the raw emotion of pain and disgust into action.
I don't think it's appropriate to show blood and gore when there's nothing at stake, but these are not such instances.
If your husband/wife/son/daughter/parents were killed in that crash, would you want your young child walking past a news stand in the street to see their mangled bodies in a field displayed for all and sundry to gawk over? Would you want the rest of the world to see and remember your kin like that?
Somewhere in the mix, there has to be an element of basic human dignity and respect towards deceased people, and their loved ones who have to come to terms with that fact.