In past decades protests against government policies have often been initiated by students, sometimes with brutal retaliatory reactions from the police and military. Students have died during some of these protests, but major changes in policy have sometimes resulted.
Amongst the most famous of these was at Kent State University, Ohio in 1970 when four student activists were shot dead during protests against US policy relating to the Vietnam war.
http://uk.youtube.com/watch?v=ouCJ-hdMFyw
In November 1973 Athens polytechnic was the focus for student-led protests against the Greek military junta. Civilians were killed in the backlash to these protests, which were later considered to be the beginning of the end for the junta.
Student pro-democracy protests in Beijing between April and June, 1989 led to the infamous Tiananmen Square massacre.
I myself participated in student protest marches in around 1980 in the UK (altruistic I admit, and hardly of world-changing consequences – they were against grant cuts!).
Why are students and other young people not forcing governments to consider policy changes relating to issues such as the war in Iraq, poverty in Africa, and even the political stalemate in Cyprus? Where has the spirit of idealism, radicalism and activism gone in the youth of today?