You went to great lengths to install all the necessary technologies to prevent hacking attacks, such as expensive firewalls, antivirus software, anti-spam systems and intrusion detection/prevention to

Regardless of how many technical security controls are deployed, untrained or negligent users remain vulnerable to social engineering tactics such as phishing, pretexting, and baiting. Attackers exploit human psychology and ignorance rather than technical vulnerabilities to gain unauthorized access. This is why security awareness training is considered a critical layer of any defense-in-depth strategy.

Zero-day exploits are unpatched software vulnerabilities, not the human behavior and social engineering susceptibility that Peter identifies as the fundamental weakest link.

Polymorphic viruses are a technical malware challenge for antivirus systems, not the human ignorance or lack of training that Peter identifies as the root cause of security failures.

Spam emails represent a technical delivery mechanism, not the human carelessness or lack of awareness that Peter identifies as the core weakness in the security chain.