I think that what happened is really sad. For a 6 year old to have to go through that is horrible, but you have to remember that emergency services get loads of prank calls, and obviously something about this call made them think it was just another prank.
I'm not saying that what they did is ok, but think about how terrible the operator must feel now? They were just trying to do their job and not waste people’s time, and they made a mistake...now someone is dead because of them. I don't think the operator would be too pleased about having to carry that thought around for the rest of their life.
Somewhere, something went wrong, mistakes were made and people will have to pay the consequences for those mistakes, no doubt. I don't think that the operator deserves to be sent to prison for something like this. I think knowing that someone died because of you is a big enough punishment.