state few examples of complicated behaviour of human beings in an organisation which led staffing function as an important function?

In a situation of conflict of interests among various employees in the organisation regarding the appraisals and increments, staffing helps to resolve the disputes by appraising the employees on the basis of their respective performances and contributions. Also, rather than hiring incompetent people on the basis of their background, staffing helps the organisation to hire productive and performance oriented employees.  Hence, staffing helps the organisation to achieve its goals by sidelining the complicated behaviour of human beings.