Theft

Unauthorized users often try to log into a network to steal corporate
data for profit. Employees who have been terminated often feel resentment
and anger against their former employer. It is possible for some
users to turn that anger into an attempt to steal corporate data before
leaving their company. This is why the easiest type of security measure
is simply to disable a user’s account at the time of termination. This
action is a good security measure and prevents the likelihood of account
abuse during the transition out of the company.