My guess: this fits exactly in Watchtower's MO (as everything they do).
- It reinforces the persecution and Armageddon complex.
- It gives Watchtower a documented way to show the government they really are a charity because they give non religious disaster preparedness courses.
- As per point 2: I wouldn't even be surprised if Watchtower gets some kind of government grant or subsidy for their Disaster preparedness school....
- It gives Watchtower yet another way to impress the JW with their disaster relief works. That way JW will give more money for that goal, and Watchtower gets to earn even more from their profitable insurance scam.