[underwater]

A lot of people do this very badly. They craft a brainstorming session designed to arrive at their pre-selected destination. They either design the process to steer the conversation, or shut down tangents as they go. This always feels manipulative and scummy.

[libertine]

But that's not brainstorming, that's something else.

[brongondwana]

Laundering a pre-arranged plan, aka "brainwashing"