This is something that you should answer for yourself because your feelings may well be different from mine. I will explain my feelings.
To me, what the three greasers did for the kids who were trapped in the fire is rather heroic. I feel that it is heroic because they put themselves in a very perilous situation when many other people would not have done the same. I would imagine that the majority of young teens, when faced with a similar situation, would feel that they were unable to be of help. They might want to help the kids in the church, but they might figure that they were unable to help or they might feel too afraid to try.
I am saddened by the fact that Johnny is so badly injured and I fear for his life as well.