The lack of knowledge and skill to operate a multi rotor to me isn't the problem. Go to you tube and you can watch countless videos of people who have the skill to fly doing all kinds of stupid things with traditional RC planes. People in general just don't care. I think the problem is the fact that these MR can go places that the traditional planes could never go other than above 400'.
I heard a story a couple of years ago in the town I live, a hobby store worker flew a multi rotor from the store to the local mall and back which was around a 1/4 of a mile away. He did it simply because he could and is an experienced pilot. So it isn't just the lackies causing the problems.
That MR could have ran out of battery or maybe even had a problem with electronic and down it goes. There aren't any fields in between either.