[zzzeek]

the short answer from my immediate experience seems to be that people just dont get along with each other these days. Our relationships with other parents in our town must remain as shallow as possible because once there are obligations to be shared in any way (simple obligations like "we said we'd all get together on tuesday" which means all those people have to either show up or cancel ahead of time, bonus points for keeping the engagement even if something "more fun" comes up 5 minutes before the event) everything seems to fall apart. Your new dog bit my dog because I was sharing a snack with him? No, we're not going to "work it out" and train our dogs together, we're going to instead "dont ever speak to me again or let me ever see that dog in the same place I'm walking mine again." This is how people are.

Putting all these folks into a "shared community" that actually codifies the obligation for everyone to work together....Well you'd need to get a very special group of people to pull that off and even then, im sure the falling outs are pretty awful nonetheless.