It is revealed by some who knew the shooter that he was bullied by the two students he targeted. It wasn't a designed mass shooting but other students could have been shot too. At least one female had ear damage and another from falling over a table.
We have seen this before where a student feels so bullied he either kills himself or comes after the tormenter with a firearm. A shame he couldn't find another avenue to help him.
Now one student is in critical condition and the shooter's life is pretty much toast.
Another law abiding citizen
"Those who do not learn from history and condemned to relive it".
"There are those who will debate the necessity of wilderness, I will not, either you know it in your bones or you are very very old". Aldo Leopold - Sand County Almanac