[abdullahkhalids]

It's a bit more than that.

You should trust political volunteers after you have seen their track record of being honest and truthful. (Though there is some default amount of trust the process gets because of the adversarial nature of volunteers with opposing biases checking the process).

This is along the same vein as

You should trust candidates for the seat after you have done your due diligence that they have honest and truthful, and will faithfully represent you in the legislature/administration.

as well as

You should trust civil servants to have done state activities justly and produced truthful records and reports of state activities after you have seen a record of them doing these things correctly over time.

Democracy with humans is built on a lot of trust in humans. We have to keep this in mind when arguing about these things.