Tell that to the BBC, ITV, and Sky News here in the UK. They show dead bodies all the time. I find it distasteful. I get it - people died, you don't have to show me their bodies to get your point across.
A media's distaste for violent images is not the issue here. Photographs very similar to these are published every day by tens of thousands of outlets around the world. The issue is that these photographs are coming from an unknown source and not many editors are apt to trust unknown sources randomly emailing with conflict images these days.
Source: I hire and direct photographers in war zones professionally.
Maybe these pictures go against the prevailing vision the media wants to disseminate.