How do you deal with the cultural challenge of convincing people there's value and selfish benefits to having more transparency?

I've noticed that in large organizations certain information are held by a small number of people who may be reluctant to share them for political reasons. Another challenge with internal prediction markets is the possibility that knowing the "probability" of an project-related outcome reduces morale and hence creates a self-fulfilling prophecy that further reduces the chance of success. Appreciate your insights.