Do not know if this report accurate, but might be..
If 20 or 30 out of 2000 - 10,000 want to cause trouble by throwing stuff at police...that would sound correct..
One percent cause trouble, 99 percent ok..sound familiar???
"Every gun that is made, every warship launched, every rocket fired signifies, in the final sense, a theft from those who hunger and are not fed, those who are cold and are not clothed." DWIGHT D EISENHOWER, speech April 16, 1953: