Trust? Absolutely not. Rely on? Unfortunately yes.
I think @COGZealot is on the right track that Silver needs to help us. I'm not sure if it's as simple as aligning goals like Silver seems to imply, or if there's more to it.
I still suspect there is some sort of magical connection between us and and them. Perhaps even a connection to our inability to use the magic since our reintroduction. I never trust anything I don't understand, so I'll work with them for now but will stay vigilant.