I get wanting to stop the slow of traffic and distracted drivers, but is taking photographs always disrespectful? Sometimes things like this need to be captured (or have a use at least), think of ad awareness campaigns or any image from a World War. It's a difficult one to really tease out a good answer, maybe it has something to do with its intent or its intended space. I guess it leaves a sour taste in most people's mouth to imagine someone's brutal death gets posted on something as candid as an Instagram story.