Frumnotyeshivish
I heard an interesting thought from Rabbi Shafier of the shmuz. He asked why is it that we should hold someone who grew up in a bad environment where drugs and murder is common place responsible for crimes he commits. His answer was that Hashem created every person with an inner knowledge of right and wrong and everyone therefore knows right from wrong (not talking about someone mentally deficient) with regard to things like murder and theft. Therefore if one does it he has made a bechira choice and done such a crime he must be held accountable.