First off may I ask why you are going on a tangent?
Second off the word terrorists was directly in quotes to insinuate that it was the slang term of terrorists...
And Thirdly Yes everyone is wrong,
Terrorism is defined in the Code of Federal Regulations as “the unlawful use of force and violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives” (28 C.F.R. Section 0.85). So everyone saying it is a terrorist attack is assuming the person wants the 'furtherance of his political or social agenda's'. Was the arora shooting a terror attack, if so what did that man plan on getting politically. How about columbine.
I don't mean to be vindictive...
Here is the FBI's site if you wish to check my research
FBI — Terrorism 2002/2005