I need some administrator. I also need some separation of duties. It's not a panacea to separate duties, but temptation and circumstances often create issues when there aren't checks and balances. Even if you trust someone today, that doesn't mean they are worthy of total trust.
Be careful of pinging the needle that we trust no one or everyone. Or that we trust them to do nothing or everything. There are a lot of spaces between there.
I don't expect any security system to prevent all issues. I do expect that I have the ability to account for some issues and track back on others. An administrator that owns everything also can erase and prevent us from understanding what happened. The military has to trust people, and they do have issues. They also put in controls that let them prevent future issues by tracking who did something, and controls that try to ensure that in critical situations, it's not easy for one person to go rogue.