I hate how they are constructing news stories like this by dropping in the word drone, and adding a little fear mongering to stir up us "common folk". It may not be useful news, but it sure must get the eyeballs...
UAVs, on the other hand, have lots of interesting uses which are also potentially dangerous. That means your risk is from normal users who are just ignorant or careless, not just pranksters. Thankfully there are not a lot of people out there willing to deliberately endanger aircraft, but there are a lot of stupid and ignorant people.