Are you concerned about employees or children misusing a system intended for specific  applications or intent? Wasting company time is a considerable concern when running a business. Employees that are consistently acquiring viruses or having network issues could be  a sign they are not using company time appropriately. Abusing time and systems open several security issues that if gone unnoticed will only create larger complications in the future. As a parent, safety from internet predators, and going to sites that are inappropriate, is the integral purpose for monitoring any system.