I think everyone can be saved, it just maybe that your not meant to be the one doing the saving, ultimately you cannot help anyone unless they can help themseves you can be right in every possible way, but until they learn for themselves there is nothing you can do. It like watching someone you love and you see that there heading for a fall, but there is nothing you can do to stop them! They have to fall so they will learn, and the hardest part of all is that they have to be the ones to pick themselves back up. They have to do the work, but you can help in little ways, by being there for them, so they know that if they do need help then they can come to you.
Yes its hard to sit back and do nothing, we just want to go in and save them tell them all their problems and how to fix it, but it does not work like that.