Defiance- Are their actions justifiable?

When the Jews living in the forest in the movie "Defiance" take revenge and steal to live, I feel like it's a necessity in order to live. The revenge was pretty reckless though, considering their own could die from it, but if you put yourself in their place, parents being killed, what would you do? I know I would want to take revenge for my loved ones. The stealing is definitely something they need to do in order to have enough food and protection for theirselves and the people they're protecting.