I'm not sure if understand your question, but I can say something from the position of the tourist.
The tourists are normal people like you, so you can meet many individuals among them. They are on holidays, so should be relaxed, interested in everything around them, but... sometimes the are not. There are people who like to talk to locals and are interested in their country and everyday life - in exchange they can tell you something about their country. But there are people who don't like to talk to anyone (especially when they don't have to) and sometimes are affraid of talking to local people (maybe heard some bad stereotypes about them or maybe they don't feel comfortable speaking in foreign language). You have to estimate the situation - nobody will talk to you when is in hurry, affraid of loosing his group, guide, bus, ... And when you start the conversation you have to read the emotions from the other person's face and know... when to finish it.
I like to talk to local people when I have some time during my journeys... except for one thing. It happened to me that I realised that the only thing the local man wanted from me is that I should buy some unnecessary souvenir from him. Such situations can cure your readiness to talk to locals for some time.