HCMW, my point about communication on the course being an issue related to how those who compile race reports may not always be aware of fatalities.
I don’t think the answer is communication over the tannoy. My wish is that information about on course fatalities should consistently be made available in the public record of the meeting e.g. in the stewards’ reports.
Where comment is regularly made in these reports that horse X lost a shoe or horse Y finished lame, I don’t think it is too much to expect that they could also mention horse Z had to be euthanised, or was taken away in the horse ambulance for further assessment.