I don't believe in fixing people. But, if someone posts that they are in a situation where they are currently unhappy, I will encourage to look at possible solutions to change the situation or to change the mindset. So when I see someone hurting, I like to look at constructive action that could be taken. That is how I like to deal with my issues as well.
Of course, some members prefer to vent and are not ready to take that step. They are hurting but not ready to even attempt to let go of that hurt. That's fine too, but I always appreciate the heads up when that is the case. It can be disheartening to type out a thoughtful reply only to have it put down or ignored completely.
Oftentimes I'll have no good suggestions because I have no experience or can't relate. During those times I'll offer a hug and just an acknowledgement that I'm listening.
So to summarize, I don't believe in "fixing" people, but rather working on changing life situations that may be making us unhappy.