Ding Ding! Question - how are they going to get to Lingling if they burn the busses?
If they've taken out the whole fleet, this will presumably starve the bus company of the funds needed to hire thugs to prevent private minibus services from operating along the route. The problem isn't the lack of vehicles - it's the monopolization of bus routes, with hired muscle to back it up. Think of the Chinese government as the Mob running protection rackets, but with an army and nukes backing it up, and you've got the general idea.