geocom: Its an explosion in the same way that lighting a match is.
Birds also cause there to be metal fragments in the engine as they break the compressor fans on there way in.
Aircraft today are designed to operate with one engine down. One of the better know bird strike incidents is the hudson landing. In this case he hit a flock of birds which went into both engines.
http://gizmodo.com/could-a-jet-engine-withstand-a-drone-1690833795
From your own article though "But even if drones are unlikely to take down an airplane engine, they can still cause expensive damage and delayed flights. And they pose a bigger hazard to smaller planes with smaller engines that may not be able to handle several pounds of plastic or metal".
As you know, most airports don't just have Boeing 777-300s and Airbus A380s, many of them are going to also have little Bombadier Q300 and the like, some of which may react ... a little worse than the jet airliner. Then there's the expensive damage. I'm pretty sure drone operators don't have the insurance to pay the tens of thousands to hundreds of thousands to repair a jet turbine after their drone gets sucked up and tears up the inside.
And to top it all off, your own article has a few too many "probably"s for my liking. The battery will "probably" burn up before the volatile contents reach the compression chamber. Something that most airline passengers would rather not chance.
Safety isn't something that we should take chances on just because you want to fly RC planes or whatever. The plane may be designed to be fault tolerant enough that it shouldn't cause any major issues if a drone gets sucked into an engine, but that doesn't mean we should be exposing people's lives to the risk of being that one time out of 1000 that the plane doesn't survive it just because drone operators want to have fun. I don't think that it's too much to ask that drone operators just stay the hell away from airports and flight paths.