There's more than one person who needs a heart for each heart that becomes available.
That makes people believe that perhaps some people deserve an organ more than others. It allows us to quantify how much someone deserves an organ. A rich person like Steve Jobs can register on organ donor lists in multiple states because he can fly to any of them on his private jet any time in order to have the surgery. Some people think that if you "caused" the organ damage, via suicide attempts or alcoholism or unhealthy lifestyles, you deserve the organ less.
I think the quote at the end of the article really say what matters. Which is that a heart is designed to beat in a chest until it stops. We are not god and I don't believe there is a god who places hearts in chests and says "Yes, you will beat this long because this person deserves it." We die when we die. For one person it's suicide or by crashing our car. For someone else it's a random infection you picked up on a dance floor or it's being caught in front of that car when it crashes. No one knows, can know, or can even attempt to predict the length of a person's life when/after they receive a transplant. we have no right to say it was not justified simply because we decide a person didn't live as long as he should have afterwards.