[@Hekazu]
Every issue you stated, that's how he's connected to the plot. His source of ammunition has been cut off because of this guys disappearance. His source of drugs has been cut off. And his "divine crusade" is going to come to a screeching halt if he doesn't help figure out what's going on and find another source.

So now he must decide whether or not it's worth it to suffer the evil of existing in the society he deems so evil. Just to find a fox and source of ammunition, or find what happened to his old one.