As an information security professional I know that no network or computer system is invulnerable from attack and compromise. The threat landscape is constantly changing and the bad guys are almost always a step ahead. What can be done is that the risks can be minimized. The buzzword used in my industry is Security Risk Management.
Managing diabetes is like practicing effective risk management. To do that I need knowledge; about my body, my pancreas and and the various risks. The knowledge base is constantly changing with new research and new insights.