Re: Attack mode?
Although I don't agree with the "screaming" tone the RTH idea is one that occurred to me, return to home triggered by a special code would be safer that most other options. These devices are above people and places so any return to home should be in a swift and controlled manner, it would also allow "advice" to be given to the "grateful" owner.
Shooting holes in lipo batteries above fire prone areas seems somewhat flawed to me.
I do concede we probably need someone's expensive drone taken out of the sky by a concerned citizen and the resulting news story (pub dicussion) for some people to get the idea it may not be a good idea to fly some places.