We have to consider the human condition and the phenomenon of the bubble of control. There is a fear of change in all of us, and humans inherently believe that change will take something away from them (control, autonomy, space).
When asked to share information, if we don't make it a two way conversation (or negotiation), change feels imposed and as humans we are more likely to hold on tighter to our span of control whether that be through withholding data, opinion, or even time. We have to remember that even Stakeholders are #HumanFirst