I am not looking to be saved or rescued. However, I would agree that:
1) Other people's negative emotions affect me a lot. It is easier for me to try to solve whatever is bothering them (because of how it impacts me), rather than just leaving it be. I think maybe INFJs have a more permeable emotional barrier. Hence the difficultly sometimes in even sorting out where the source of our emotional discomfort is originating and where the responsibility lies to deal with it.
The closer I am to someone, the more their discomfort or unhappiness or negativity affects me. This is part of the reason why someone doing something just to humour me really isn't enjoyable at all to me. Unless I know that they are feeling content as well, their accommodation doesn't help me. Hence, I often tend to overaccommodate, sometimes to the point of resentment (especially when they don't recognize that I am choosing their comfort over mine). As I've gotten older, I'm getting better about this, but it's still difficult to decide when I am overaccommodating, as part of my tendency that way is an attempt to quiet the discomfort I am feeling.
This is also a reason why I dislike larger gatherings, especially of disparate friends. I am very aware of how everyone is feeling, how they are all interacting, whether they are all comfortable and so on. The more people you add to the mix, the more there is to juggle and it's difficult to make it all work well.
2) Because I don't say anything initially when I am still gathering information, and because I have delayed processing due to Ni, many people assume that I am a lot more pliable, accepting or open than I really am. I am a fairly warm person and want to put others at ease, and sometimes that draws out the people that don't really fit in normally or that act in a socially odd manner. I've gotten better at not putting out welcome signs for those types in the same way that I used to as it has sometimes given a message I didn't intend to send.
3) There is something very satisfying in being of assistance to someone. I think every type has its area of expertise. My focus is figuring out why people act the way they do. I'm not saying I'm always right, but I think I do pay attention to human puzzles more than the average person might. I find it interesting. I also feel best when what I can offer is of use to someone in a practical way. I like to maximize the potential in other people. I don't enjoy fixing people. However, discovering where they shine best, or increasing their confidence in their own abilities is satisfying.
I think INFJs' biggest downfall is the delayed processing that doesn't always allow them to assess a situation in real time. By the time they have decided what they think about it, they are in fairly deep. They also choose other people's emotional comfort over theirs (strangely enough to increase their own comfort level), which can lead to being taken advantage of or seen as pushovers (when that is truly not the case - they actually can see what's going on and dislike it, but they also want to be seen as fair and not overemotional, so it takes awhile to prove to themselves that their initial feelings were justified and worth acting on). They often find it difficult to know at what point to bring something up, as individual instances seem too small and petty, yet they contribute to an overall picture that is very significant. It takes awhile to gather sufficient evidence for themselves that the problem is not them and that alternative action is required, particularly with people who have gained their trust.