Firewalls and AV programs are completely ineffective against state-sponsored attacks because adversaries who are targeting high value data have multiple attack vectors to choose from that would be utterly invisible to automated defenses.

FORBES: Why The Pentagon's 'Cyber Shield' Concept Is Hopelessly Flawed

Sharks regularly become impaled on hooks dragged by boats targeting high-value species such as tuna, or entangled in nets.

BBC: EU gives shark protection teeth

Targeting high-value policyholders, winning their loyalty and focusing on retention take on new importance, especially at a time of far-reaching organizational and business-process change, when customer relationships are apt to fray and attrition rates spike.

FORBES: Rewriting The Rules For Insurers