I think this is going to be a very short thread, Alfred.
There are thousands of recorded examples of abusive and neglectful parents who have attempted to cover up the death of a child.
I cannot think of one example when such an event was engineered by loving parents with no such history of neglect or mental illness. Why would they?
Well haven't those same parents claimed they were loving and caring of their children ?
It seems you are trying to show if examples can't be found perusing the internet , then it never happens or has never happened.
The trouble is, with your loaded thread title, that you seem to omit that not all cases of death/murder appear on the net, so by your 'logic' , it can't happen.
Your view is rather like the old myth that bumblebees should not be able to fly, which if i recall correctly is one of the precepts of creationists and therefore proof that the laws of physics aren't real.
Essentially, your thread is yet another attempted defense of the mccanns, and no matter what you say, you forget one prime motivation for covering up an accident...
Self preservation.