Why is the government destroying so many documents?

We are still astounded at the equanimity with which Chief Secretary Carrie Lam Cheng Yuet-ngor revealed that in the last six months of last year 23,189 metres of documents had been destroyed: equivalent to the distance between Kowloon and Hong Kong International airport.

via Business feed http://www.scmp.com/business/article/1135429/why-government-destroying-so-many-documents