Hey, Sysadmin person, prove why we should keep paying you! You sit here all day doing things, and yet nothing has happened to our servers since you got here. Why do we need you?
1. Wait for a server hdd to crash, and tell people that they suffered no interruptions because he had the foresight to do disk mirroring on the servers.
2. Wait for somebody to do 'rm -rf' on an important dir on their laptop, and help them recover from the hourly backup procedure he'd implemented on the day he joined the company (this has happened in a company i've worked).
etc etc.
Plus quoting the end of the article :
He said that the laptop rule is about appearances, giving people a sense that something is being done to protect them. “Security theater,” he called it.