I can't say that trying to "fix things" for people has ever worked at all, at least in my experience. You just can't say a few magic words or do things that will just make it all go away. I know i've really tried to help people out by doing things but.. thats just not the way it works. Most peoples problems, their heartaches, can't be changed by fighting their enemies, can't be changed by fighting someone elses battles.They wont learn anything if you do and say everything for them. Sometimes meddling with peoples troubles just makes everything worse.
The best thing you can do for your friends is just be there for them. Listen to what they have to say. You don't have to be brave for them, just be there, on their level and remind them that you are a friend and that they can confide in you.