The destruction of those firearms I find as, or more, disturbing as I would the burning of books.
The reason a government burns books, is to squelch dissenting ideas. To halt the propagation of ideals contrary to those of the state. How can they control how you think if they don't control what goes into your head?
The reason a government destroys private guns, is to cement their monopoly on force. If you have to make people do things they don't want to do, it certainly won't do to have your agents getting shot. How can they threaten you with violence when you can threaten them with violence right back?
The idea that eliminating private gun ownership creates some utopia of non-violence has been thoroughly disproven by real-life example after real-life example. The only utopia this action creates is one for those who do not follow the law.
The quote was in response to a video at that link. It has to do with the United Nations' plan for "dealing" with private firearm ownership in America.