Most humans can not be trusted either, that's why you have processes in place to test and review work

Ok, so we're talking about applying connectionist systems/models to the messiness of the real world. And "trust" isn't an on-off switch. The goal is to build systems that are smarter and more general. It's a process. I don't think even Yann LeCun has made any strong claims beyond that. He just thinks that his way of doing deep learning is better.