Why its difficult to build and sustain information system?

Both general management and IT management are responsible for implementing information security that protects the organization's ability to function. although many business and government managers shy away from addressing information security because they perceive it to be a technically complex task, in fact, implementing information security has more to do with management than with technology. Just as managing payroll has more to do with management than with mathematical wage computations, managing information security has more to do with policy and its enforcement than with the technology of its implementation.

Principles of Information Security 4th edition