Remember these words when a hundred people stare at you, rubbing their hands together, eagerly waiting for you to plunge a blade into your abdomen and draw it upwards, disemboweling yourself to save them. Or when a fiery storm melts several people into a stinking puddle, blocking the path to the Salvation Lever. Or when Mutants pounce on you, tearing you to pieces and biting into your flesh, while the rest of the group gets a precious minute to pull the Lever. All of these situations involve a full awareness of the alternative: survival.
Besides, there won't be a world, including those close to you, and there will be no one to judge you. But that's just a cold, black heart, "Dark blood inside me".
Added 4 minutes later
P.S. Cash, what's the point of all this heroism?
Just explain to me, what is the meaning of honor, conscience, nobility, and self-sacrifice (seriously).