Yes, your exact thought process may be a black box to me, but I myself am a black box made to the same (DNA etc) spec. We have millions of ancestral years of experience trusting each other and we know how to simulate each other because we are the same kind of black box. Your trust in other humans is explained much more by your priors over human behavior than by any observed behavior of individual humans--that's layered on top.

In short: we trust people because we can model them effectively, and being one helps. We trust mathematical models and traditional programs because we understand them and can check their work in any specific instance. Large ANNs don't (yet) benefit from either of these two kinds of trust.