How much would you risk for a stranger?

I noticed that Jonathan is risking a lot for little boy that he just met. Jonathan's life is already in danger, why should he risk it over a boy that is not even related to him? I would not risk anything for a stranger, especially if its going to put my life in danger. If I was in Jonathan's place, I would just leave the little boy with the Hessians and run away. He is already captured by them, he should not be wasting time trying to figure out how to save the little boy. Jonathan also buried the little boy's parents. I think that is more than enough. Overall, I don't think I would risk much for a stranger ever in my life.