I am just wondering - why is speculating what has happened in poor taste? Surely wondering what has happened is natural
I think it's just that when you think of what her family are going through, idle speculation on a public about what happened or may not have happened just seems a bit... Inappropriate I guess. Everyone will have their own armchair theories, but none of that changes the fact that these parents have lost their daughter, so it seems pointless to do it really, especially when I'm sure it will come out what happened anyway.
A few years ago, a relative of mine died in a way that made the news. There were a good few comments underneath FB posts and news stories, with a bit of speculation about what may have happened. It wasn't upsetting because a) I wasn't close to that relative and b) no one was saying anything outright nasty. However, it was incredibly strange to have complete strangers talking about someone you knew like that.
Now, I guess if that was your daughter and she had died in a horrible way and it was a huge news story and strangers were speculating about may have happened to your own precious baby, it would be pretty horrific.
However, I do also agree with you that stories like this do strike a chord and it's only natural to want to know what happened. Its a difficult one really, especially with social media as it is these days.