a) Not all drones are small: https://www.studentnewsdaily.com/daily-news-article/obama-administration-to-allow-allied-countries-to-buy-military-drones/ https:/

a) Not all drones are small: https://www.studentnewsdaily.com/daily-news-article/obama-administration-to-allow-allied-countries-to-buy-military-drones/ https://www.studentnewsdaily.com/daily-news-article/obama-ad... b) Even small amounts of radioactive material spread over some city area would probably cause blockades of that part of the city. It's also something that disrupts the life and work there. The Belgian airport remained closed for days after the attack.