I'm the guy that talks to lonely bus drivers. I don't know how it happens, but it does.
I'm also the person a lot of old - and not-that-old - ladies will suddenly speak to at the bus stop. The weather, the waiting time, or whatever other subject that comes up. Again, I don't know why me.
There's also other situations lone strangers -shopping, the park, whatever- will start talking to me. I do try to pet dogs sometimes and that sometimes leads to people talking to me but I'd say that's less surprising so it doesn't count. Once, years ago, a guy just greeted me when coming out from the subway and I was a bit confused because I didn't recognise him. So I asked and he told me that no, we hadn't met; we just passed each other sometimes when going in/out of the subway so he thought it would be nice to greet me. I smiled and appreciated the gesture. After that sometimes we would greet or at least nod. It didn't go further than that and after a while our schedules probably shifted a bit but it was a nice thing. Strangers you see routinely. It seems polite to greet them. And nice, a gentle gesture.
My impression is that there are many, and many of them crave just being able to talk to someone for a little while. Sometimes, particularly older ones, mainly ramble almost uncontrollably. They need to talk. In a way it used to break my heart seeing that. Now I don't think much about it, it's ok; I just talk for a few minutes and smile, because smiling is nice and they smile back and it's warm.
I don't initiate such conversations but I reckon I may somehow propitiate them by looking or nodding/greeting politely or something. Maybe it's that. But I've never been an extrovert and often I'm wearing headphones and have to take them off when they start because I didn't hear them at first. So, it's not like I'm particularly approachable, I'd say. Not handsome but neither ugly -I hope-. For a while I was a bit overweight. Now I'm clearly underweight but I don't think it shows so much that anyone would think I'm sick or dying or anything. I dress quite normal, have an about 1-1.5 inch beard, and in general I'd say nothing in my appearance particularly says "talk to me". But people often do. shrug
In any case it feels nice seeing those people smile for a while. Particularly those older people that tell you about some mundane stuff that means a bit to them. Sometimes their stories carry the implications of some children or grandchildren they don't see too often and miss. Sometimes it's much more personal, health issues or other problems; and it still surprises me a bit how candid people can be with personal stuff. Other times it's just literally whatever, small things in their lives like the groceries they just bought or are going for or really anything. There was this nice old lady I used to see catch the bus to avoid a sloping street. She repeated often the same story about how she was going for bread and "if I see the bus approaching I take it" because the slope often left her quite tired. Once I noticed she'd fallen and bruised her face. She was fine, she said, but it feels nice that someone notices when something happens to you. I rarely go to that bus stop any more, since I now try to walk as much as possible, so I haven't seen her in more than a year. But she was from the neighbourhood so I may pass by her one of these days. Maybe.
I know this may not mean much in their lives but I think it's a nice thing. It may brighten their day even just for a few minutes. Or maybe I'm one of the few people at all they talk to that day. Who knows. It may make a difference. Most probably not, but anyway...