Yes I'm sure that OP already knows that sitting at the negotiating table is a good position for him but all the other members of the Union don't have that privilege.
All bargaining sessions are open to observation by all unit members, and have been since day one. Ten percent of the unit was elected by single transferrable vote (Meek Rule) to speak at the bargaining table. But that is just to keep the bargaining orderly; union proposals are drafted by any interested members. We keep them all in a Google Drive so anyone can check in on the state of bargaining. We also take extensive notes for members who could not observe in real time to catch up the state of bargaining.
Once the bargaining committee reaches a tentative agreement with the employer, the whole membership will have to ratify it by secret ballot before it goes into effect.
Where is the "privilege" in this system, exactly?
Freely pooling together...like a union? Your argument seems to hang on the notion that once people do pool together, they lose all control and the union they created turns on its own members. That's like saying corporations shouldn't have any management because the managers will just enrich themselves at the expense of the owners.
It's particularly odd to read this since the person you replied told you that they're literally on the bargaining committee. So you're warning them about...themselves?