There is no single approach to securing an Amazon S3 bucket that will work for all organizations. A secure S3 bucket requires multiple layers of security, including Identity and Access Management (IAM) policies, Bucket Policies, encryption, and Block Public Access. IAM policies are crucial in defining access control points between Principals, Actions, and Resources, while Bucket Policies can further scope down access to specific resources. Encryption is also essential in protecting data at rest, but it should be used in conjunction with other security measures. Block Public Access can provide an additional layer of protection, but it's not a one-size-fits-all solution and should be carefully evaluated on a case-by-case basis. A mental model of policy and how it relates to actions and resources is critical in designing secure S3 buckets, and using AWS Managed Policies can help streamline the process. Access logging, object-level logging, and versioning are also essential for monitoring and managing S3 bucket activity.