Oh, it's very complicated.
For instance I have a friend who really wants to get married. She's asked me if I know anyone -- she has fairly stringent requirements, cultural background and so forth and we're not in such a large community. The thing is, I do, sort of. That is, I have a feeling that if I were to introduce her to a certain friend of mine, they would probably hit it off. But I can't say I wholeheartedly like the sort of direction it would take her life. If she had met him independently and asked for my opinion, I would have to say it came with reservations. There's nothing wrong with him in terms of kindness or character, but I just really see how being with him could encourage her to completely abandon her work and everything she currently values so much.
Now, who am I to tell her what to do with her life? No one, but that's why I'm staying out of it. I don't think it's a good idea for me to complicate things by throwing someone into her path who might end up being a gigantic mistake. On the other hand, it does mean that when she asks me whether I know any single eligible men fitting her criteria in the area I have to say No.