I always though it was just something those weirdly intense extroverted feelers do as a normal day to day thing. lmao... kidding!
When I worked in trauma, it wasn't unusual to walk up to someone and hug them without even so much as an introduction just because I knew they needed it. I know when I recognize something in another, the kind of pain they carry, I think it's something like that. They recognize something within us, something that tells them we're safe to unload on.
Or it could be something as simple as they honestly don't realize were preoccupied enough with our own thoughts and appear bored and as if we have tons of time and fucks to give.
When it comes to the 'lil old bitties, though, awww... I love chatting with them. I think they're so painfully lonely and when they unload their troubles, you just know it's been ages since they've talked to a willing listener.
The strangest random conversation was with a tiny little old woman at the post office who was very worried that hair was growing back where it had fallen out years ago after menopause. She took it as a sign she was going to die soon. She was terrified, so much so that she was telling this to a complete stranger. I made some kind of joke about going to get Brazilian waxes together just to make her laugh. She didn't, though, till I explained what a Brazilian was. She had the most contagious giggle ever.
*edited because autocorrect is trolling me. Yup, nothing to do with the person thumb typing on a tiny as keyboard and confusing the hell outta autocorrect. Nope. Not at all.