Or the mysterious vehicles parked at this fire station could be fire trucks, with ladders on top of them, which is why the contour is nothing like the PLA trucks.
I think of it like barricade building at the protest frontline. Busy hands need something to do. Asking the PLA to sit around watching others fail at repression is cruelty. There's only so many times they can climb their jungle gym at HQ; let them futz around with parking