The FAA is fully aware of the misuse drones can be subjected to. This is why it delayed the process of bringing drones into the commercial sector until this year and is very selective when it comes to giving airworthiness licenses to businesses.
Though these concerns are genuine but these have always been there whenever a new technology has been launched into the market. When TVs were introduced for the first time, people used to be issued license for keeping and using TVs in their houses. Similarly, there were many other things that were seen with suspicion but when they became prevalent, their use became indispensable.