Often, getting a decision (ANY decision) made is both absolutely critical, and with all the ass covering and office politics involved, nearly impossible. Even if (or sometimes especially) it’s patently obvious to everyone what the decision should be.
Yeah I guess there's a continuum between a) hiring someone impartial and not entangled politically to advise on an important decision and break the deadlock and b) paying someone to justify an obviously crappy decision while providing ass cover.