Been thinking about this. Not sure I would. I sometimes have but often I feel I don't know how to go about it and if it involved a violent thug/drunk I would worry, particularly when dd is with me, if the aggressor(s) would turn on us, maybe hurt her
Have been watching some of this American tv series and wondering how often I would have stepped in and if I would have handled it well.
It would depend on what I assessed the risk level to be. If it was someone waving a weapon around or clearly happy to use violence, I would probably yell from a safe distance and call the police. Especially if I had DS with me. In my younger days I was a great one for barging in and ticking people off, which got me a few slaps but also some gratitude.