What about IED’s & bombs? If the kid had used a bomb, things would have been 10 times worse.
Actually, it has not been proven that ‘the kid’ (19 yrs old!) did any shooting, and there will be no gunshot residue evidence or dna testing of blood if it were found because when Nikolas was apprehended his clothes were stripped off, including his shoes , and disposed of. No, not put in evidence bags, disposed of. He arrived in custody already in a jumpsuit. That’s right, his clothes were disp[osed of, so there is no physical evidence that he did any shooting!
Ref Columbine: In addition to the shootings, the complex and highly planned attack involved a fire bomb to divert firefighters, propane tanks converted to bombs placed in the cafeteria, 99 explosive devices, and car bombs. https://en.wikipedia.org/wiki/Columbine_High_School_massacre#Gun_control