There's
a thread about this on DU, and predictably, Trump is invoked and rich people are blamed.
For multiple generations public schools have taught students:
* They are the highest animal evolved so far;
* There are no moral absolutes;
* Life is cheap and can be taken for personal convenience (aka abortion).
With that moral education, why be the least bit surprised that some behave like animals and take people's lives outside of the currently accepted time in life?!
Trump had zip to do with this. These kids did as they were taught by their parents and/or teachers and/or peers, as certainly as any economically poor white or brown or black kid from a "bad side of town".
BTW, Marin County is north of SF, across the Golden Gate Strait. Marin has a lot of affluent,
very liberal, residents.