There are people who make these kinds of decisions; if what they decide doesn't suit you all, that's a problem because, as I said above, nobody will satisfy you all until somebody says "He was murdered."
Sometimes things are what they are.
Actually, there is no need to keep them secret.
There is definitely a reason to release such photographs when these matters are decided in open trial. There was no open trial, so we have "reports," in lieu of open trial. Reports are not as good as an open trial, as evidenced by the continuing controversy. Making photographs available brings the situation closer to that of an open trial, which may help bring matters to a conclusion. So THAT is the NEED for the pictures being made available.
Many have said "He was Murdered." But, the only people who get to see the evidence are those with a vested interest in: "It was a Suicide."
If all the evidence is put out for all to see, then at least the argument will no longer be on "competing theories", but on competing interpretations of the evidence.