Trust is a big word and in Bitcoin, it's everything. If you trust people with knowledge of your keys, then you've given them every right to spend your coins.
Not only that, but they have also given them every right to their life based on the number of Bitcoin holders who are murdered by people close to them. Additionally, we must exercise caution when disclosing ourselves as Bitcoin holders to others in order to prevent being physically attacked by cryptocurrency thieves who abduct or kill their victims.
