I would say overall crime is not an issue in San Anselmo. Violent crime is somewhat non-existent. The answer from Kim touches on the few "crimes" we see here. I believe this site to be a great REAL ESTATE tool, and not a parenting review column.
There is literally not a single street I have been on in San Anselmo where I have felt unsafe.
I have seen crimes of immaturity. The only time I have been victimized, some one lipsticked my car while parked on the street. I am not sure how old they were though.