Probably minding their own business and avoiding a possible kicking or stabbing.
I hear raised voices and arguments all the time when I'm stood on the taxi rank between jobs. I see people laid out all over town. Most of the time I just ignore the lot of them. I'm usually a good judge though, I think I'd know if someone was actually in trouble or needed help. They're probably 1 out of 100 though. (number of the top of my head)