This is one of the greatest problem i ever seen:
What if death ask you whom he will kill to the 2 persons you love
(siblings,parents,friends,lover,pets, etc.)

both have the same age
both live the same level of life
both contribute same level work
you love them both and they are the same in your heart

whom do you choose and why?

(if you try not to choose one, both will die)
(in is unstoppable, you have no choice but to answer death)

if you choose one then that could be unfair and not morally good
if you don't choose then that's worse

By choosing you are saving the other. Therefore you are not bad, or good. Simply human.