Authorities want to control a crowd not annihilate it.
Hence the reason they wear riot gear use tear gas, water cannons, rubber bullets, canines and other designated non-lethal methods
That...
A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)
The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.