You do tend to over think these things, don't you?1) False alarm?
2) Random criminal/substance-altered human walking about in daylight on school property brandishing weapon?
3) Garden variety school shooter psychotic-break- nothing to do with ethnic/religious make-up of student body?
4) Racial-religious hatred motivated psychotic-break shooter?
5) Racial-religious hatred motivated shooter not suffering from psychotic-break, just plain old stupid-evil?
6) Other_______?
1) 90% is my guess
2) 9% but I imagine that depends on neighborhood.
3-5) less than 1%, and really, who cares about his motives at that point? While I'm sure there have been racially motivated school shooters, the big body counts go to frustrated geeks in or recently out of school. Fear the students, not random strangers and their differing politics.
For the most part, even the most extreme racists I've known don't actually DO anything, they just spout some stupid things when they get drunk enough, and DON'T do things, like go to certain parts of town.
I think it's for the best, like covering your mouth when you cough, no need to spread sickness. Self quarantine seems a reasonable solution to folks with unreasonable ideas.
But seriously, unless you are in prison, someone being a hard core racist still doesn't have much affect on anyone else. I wouldn't think it worth factoring in to a survival situation.
I would be thinking in terms of escape routes, hiding places, and barricades, rather than trying to piece together a motivation.