Is it worth it
Is it worth helping out someone worth the time or the effort? When you hold open the door for the person behind you. Did it really change the world? When you gave some spare change to the guy at the gas station. Did it change his situation? When you give your friend advice time and time again, but they never listened or learned. Was it really that helpful?
I would argue, yes. Life is rarely about the big battles and few people ever make a massive impact, but that doesn't mean the small things don't matter. If you've ever had a sliver in your toe or a grain of sand in your eye. You will understand that it doesn't take much to make to affect someone's life. And remember, whenever you hold the door for someone or give a homeless person change. In that moment, you changed their world.
Except for your friend who asks you for advice, never takes it, and gets themselves in trouble as a direct result. In the words of Ron Swanson, "Give a man a fish and you feed him for a day...Don't teach a man to fish and you feed yourself. He's a grown man, fishing is not that hard."