I understand the thought at the time was that the shooters were the victims of bullies. It became known in law enforcement circles that the shooters were, in fact, bullies themselves.
Now it has become well known, see:
10 years later, the real story behind Columbine - USATODAY.com
"The killings ignited a national debate over bullying, but the record now shows Eric Harris and Dylan Klebold hadn't been bullied in fact, they had bragged in diaries about picking on freshmen and "fags."
"A decade after Harris and Klebold made Columbine a synonym for rage, new information including several books that analyze the tragedy through diaries, e-mails, appointment books, videotape, police affidavits and interviews with witnesses, friends and survivors indicate that much of what the public has been told about the shootings is wrong."
The national attention brought to bullying of all sorts as a result of this horrific event continues to this day in school systems everywhere.
Make no mistake though; these two were not misunderstood kids lashing out at those who bullied them; they were vicious buggers who understood fully what they were about to do. They thoroughly planned their attack for over a year.
DISCLAIMER: this post in no wise constitutes a bash, poke, prod, or snipe. It is merely for informative purposes and may be freely ignored without fear or favor.