The biggest problem is spoiled people, lawyers/insurance, media, and dumb asses that think they can do anything anywhere.
How is that you say. Well!!!
People are spoiled!! And don't want to hear anything they don't want to hear.
Lawyers will sue on a dime and insurance has to cover an extremely wide and mandated market mostly due to the lawsuits.
Media portrays our hobby as a means for terrorism, especially the last several years in movies/ tv shows.
And the DA's flying over fires, the WH lawn, around the Statue of Liberty, etc. etc. etc.
Anyone that has anything is not going to risk losing it due to a law suit for sake of toy airplanes. I know I would not risk it, even if the suit is frivilous attorney fee's are not.