I didn’t follow it closely but his story seemed plausible.Violent crime...break ins,murders,etc...is so bad there (including in prosperous areas)...that Detroit looks down right peaceful by comparison.Sleeping with no legs would make you feel more vulnerable for sure.
Parts are plausible, others not so much. I have trouble with him waking up thinking there was an intruder in the home, his girlfriend not being in bed, and him deciding to shoot through the bathroom door multiple times to kill the intruder on the toilet. It just doesn't seem as plausible as him shooting her intentionally.