Here's the thing about life. Nothing is ever easy. If you want something, life is going to make you fight for it. You're going to have to swear, scream, spit, and scratch all the way to what you want. And sometimes, you never even get it. So why bother fighting? Because that's the whole point. The fight is what makes us who we are. It's what develops strength, character, creativity, ingenuity, all those things that make us wonderfully human. Of course, sometimes the fight is what makes us all grotesquely rotten people, but that's also the point. In life there are winners and losers. And being a winner doesn't mean you necessarily get what you were fighting for, but it means you learn the lesson and move on. The losers never learn.
Is any of this remotely comforting when you don't get that thing you want? Hell, no. If someone you love is suffering crushing disappointment and you try to reassure them with thoughts of, "but this ordeal will make you a better person, so chin up!" you'll probably get punched in the face. And you would deserve it. But hopefully someday your loved one will look back on that time of heartache, pain, and loss and know that they emerged better and stronger for having endured it.
Someday can seem awfully far away when you or the people you love are hurting. But sometimes someday is all we have to cling to. Until then, you just keep fighting.