Don't get me wrong though. Nextdoor's program to forward suspicions to the police is the wrong play. No one should be arrested and put at harm's way just because someone was a bit anxious one day.
I just think that we should be nurturing a high trust society, rather than moving to a low trust one where, on the surface everyone is tolerant/accepting but in reality they aren't really thinking about the other people in their community at all. "Not my problem." "Oh no, I can't let myself be bigoted. Who am I to judge the masked man walking around with a chainsaw at midnight? He might just be headed out to trim his garden?"
Another problem is that such means of inflicting harm on people exist for Nextdoor and it's users.