Not everyone cares about politics though. And  that's where I understand the need for "safe" community. And nostr experiences are currently lacking in this direction. 

Imagine I'm an older lady* that's really interested in beautiful crochet and hand made stuff, I would like to have experience where other people show off their crochet, we have fun, we can joke and help each other. 

Since I have many stresses, worries and other issues in my daily life and I get my news from elsewhere I would just like this place for my fun time, for my rest, for calming down. 

Now what is the chance that people start trolling (preying on escalated discussions), people call each other nazi/commie, I'll get exposed to politics, people explaining their virtues, trump, conflicts, biden, videos of murders, linux developers, scammers, porn, ukraine, etc. 

If the chance of me being exposed to garbage (we can call it *P(shitshow)*) is larger than lets say 10%, then the fundamental reason for me participating in that community (=app) disappears. 

One interesting side effect of this is that there are many (MANY!) great niche communities that use super old websites/forums software (powered by things like phpBB), because younglings usually don't find it slick/new enough, so quickly lose interest. 

*) I'm not saying crochet is only for older ladies, I'm saying that this specific crochet aficionado happens to be an older lady in the situation I just made up.