Alright, before I go to bed, let me kind of say what I have in mind.
This world is kind of set to 50 years into the future. But, since the demons have killed off most of the human population, and most of the buildings and cities that once stood, being able to make ammo is just about a lost skill. Having a working car or truck is not too had, but finding someone one that is willing to blow there face off to refine the oil is.
So, think about it as, since guns and cars take things to run and be used, they are kind of left behind as "useless pieces of metal" and traded in for swords and other up close weapons. That not saying that you guys will not get "powers" later on in the game that will be better the said weapons. Since you people will be the first living people able to walk around in hell, who knows how it will change you guys.