To quote:

As opposed to NASA's "impacting" method, China would use a "more clever" method that could be called "pasting", he said, explaining the plan was to soft-land a craft with an engine capable of pushing a comet or asteroid off a collision course.

Please call me paranoid, but I wonder if this could ever be used as a weapon to threaten certain areas of Earth with, say the United States?

Please don't tell me the Chinese military hasn't at least considered such a plan.

And while I doubt any terrorist group could manage the feat, China certainly has the space infrastructure (or will so). I can see it in their best interests to keep their one main rival in line in case we want to stall or stop their plans.