Your Rogue Trader can acquire a new cruiser in 30 minutes: 10 minutes to order his ship to ramming speed, 10 minutes to swarm the ship with armsmen and assault boats (after nearly shearing the cruiser in half through ramming), then 10 minutes to fight to the bridge and personally duel the Captain for control of the ship.
Being insulted warrants a larger military response than an expedition to clear a void station of Chaos Worshippers