Why can't the million-ton armory in Radiation 3 get in?

No mission. The key to the armory is with the mayor. After talking to Burke at the hotel, he went to the mayor and reported his intention to detonate a nuclear bomb in the town. The mayor went back and arrested Burke. After the conversation, shoot the mayor when he turns around. At this time, you can kill Burke and avenge the mayor (add morality). Then you can find the mayor's trench coat, hat, a China assault rifle and the mayor's key on the mayor, and then you can enter the arsenal. The machine guns in the arsenal will still attack you. The computer on the table next to the black can stop the attack of machine guns. This computer also controls the welcome robot at the door. Taking the weapons in the armory is stealing, which is immoral, and the weapons in this armory ... are all about 10% durable. Basically ... there's no point in entering this arsenal.