It's too bad, I think idea of organizing a social network based on proximity and centered around community information is a viable idea, It's just that NextDoor is doing that with our worst instincts.
I am trying to share my observation, and express my disappointment that a company has created a skinner-box engagement loop based on fear and neuroticism. People will always be afraid, but technology should be used to bring out the best qualities in humans, not amplify the worst.