i'm looking at this from a naval perspective which of course applies to air ships the anti aircraft guns generally provide defensive hails of bullets used to fend off planes or missles if the enemy is dumb enough to get blasted apart by this hail so be it but if not then it's likely only going to glance the enemy and prevent them from making a devistating pass. Also let me say that implying that maneuvering this ship is pointless would be the same as implying maneuvering an aircraft carrier is pointless. Maneuvering big ships like this in combat serves to alter angles and make it neccessary for the enemy to re-calculate their attack while you already have your own plans in motion.