after demonstrators threw objects over the fence, as the President Bush inaugural parade passes by on Pennsylvania Avenue in Washington, January 20, 2005. Anti-war chants competed with pomp and circumstance during the inauguration of Bush for a second term as president took place amid the barricaded streets of central Washington. Photo by Jim Bourg/Reuters
More DC protest picts can be found at the url
Your text, and the reality
"Police officers fire streams of pepper spray into a crowd of protesters AFTER demonstrators threw objects over the fence"
Now if the reality was "Police officers fire streams of pepper spray into a crowd of protesters AND IN RETALIATION demonstrators threw objects over the fence" you may have a case of police brutality.
Thank you for showing how stupid "demonstrators" really are.