Almost all human interactions involve trust. Political systems just exist because enough people trust in them. Same for money, juridical
systems, laws, contracts, etc.
Pompous social engineer blog post: "Dunkin Donuts is laughably insecure. I was able to steal lots of donuts by lying and abusing the trust of employees. Hahaha, Dunkin Donuts security sucks, what a joke. They don't even question that my story was completely fake and that I was just a good actor, what a trash company"