But Columbine spoke to a larger issue. It's really a matter of culture. It's a culture that somewhere along the line we've begun to disrespect life. Where a child can walk in and have their heart turned dark as a result of being on the Internet and walk in and decide to take somebody else's life?
Columbine was a dark moment in history
the statement is that Columbine spoke to an issue of culture of darkness.  we can discern that this means that Columbine represents somethnig dark or terrible 
( z1 moment :domain ( z2 event :name ( z3 name :op "Columbine" ) ) :ARG1-of ( z4 dark ) :part-of ( z5 history ) )