The purpose of introducing a "just culture" is not to promote change, but to cover the arses of the politicians when they make changes which will do the opposite of promoting justice, e.g. only approving the promotion of VSOs who say "Yes Sir, and that won't affect our capability Sir" to every proposed budget cut.
One look at every other branch of the Government will tell you that.
The only solution is to elect MPs who actually have moral, just values. Good luck with that - and that grass isn't any greener outside the UK.