Hong Kong is an island and the part they occupy seems to be very inclined. Even if they manage to bring tanks in somehow, all they'll get is many expensive high

Hong Kong is an island and the part they occupy seems to be very inclined. Even if they manage to bring tanks in somehow, all they'll get is many expensive high-rises damaged, roads destroyed and many tanks lost (since they're trivial to immobilize). Will look like authoritarism fail.