Hardcore Henry - w'sup
Get used to this kind of perspective throughout the film, and don't expect much of an answer to your question, "why is all this happening..."
Hardcore Henry starts out with an anonymous torso getting his legs and arms screwed on by a smoking hot lab tech (and from my experience working in an engineering environment, the only type of lab tech is the smoking hot kind). The SHLT proceeds to say her name, say Henry's name, and vaguely allude to how he won't remember this, that being normal, but that they were once married. This is about as much of a story as we will get over the next 90 minutes of face-grinding, stabby stabby-shooty shooty excellence. The frenetic pacing is really what keeps the movie going, because if they ever stopped and started explaining why or what was really going on - instead of murdering whoever was about to give away the big reveal - I'm almost positive that the majority of audience members would have left the theater. If they attempted to give depth to a first person narrative that revolves almost singularly around kicking/shooting/stabbing/murdering the shit out of all the baddies, it would've cheapened the movie. Because you and I both know, no matter what, this is about the endless slaughter of faceless lives.
hardcore, henry. hardcore.
By rationalizing or explaining anything within the movie, the creators would've shifted the consumer's focus away from what's really important in life: senseless violence. I don't go to movies to understand politics better, or to get weepy over a "just cause" that I will literally forget about 10 minutes into my popcorn induced deuce. I go to the theater to see what I can only see in movies and on ISIS' twitter stream, and Hardcore Henry is ISIS' twitter stream on a rumspringa from Islam. AKA awesome.