Either a person accepts extreme, but very unlikely, risk by exercising perfect candor with everyone or they decide to clam up around people lower on the 'oppression hierarchy' which costs them almost nothing to do.
Why would any rational actor not choose option B unless they're getting some reward great enough to offset the risk of option A?
All power is fleeting.
All power is contextual.
Any one who tries to deny these truths, is attempting some manner of deception to further their own power at someone else's expense.