Nature demonstrates that decentralized systems can be resilient and can produce emergent complexity and incredible sophistication without the need for a central authority, hierarchy, or complex parts.
Bitcoin is a highly sophisticated decentralized trust network that can support myriad financial processes. Yet, each node in the Bitcoin network follows a few simple rules. The interaction between many nodes is what leads to the emergence of the sophisticated behavior, not any inherent complexity or trust in any single node. Like an ant colony, the Bitcoin network is a resilient network of simple nodes following simple rules that together can do amazing things without any central coordination.