If they get injected they are participants already.
The end user can usefully participate in the network architecture debate if enough of their messages are vanishing. If the expert then says: "oh, but 1 in 2680 is rare" other professionals may adjust their opinion about them personally.
If they then go on a crusade to get the exchange scrubbed from the record it would make them more credible to you?
If I drive across a bridge I should have the right to question the competency and the trust being put in the engineers. If something looks like a crack, I would ask detailed questions and I hope my fellow citizens would do the same. Can you really not find the logic, in good faith?
What’s yours?