So far this seems too "edgy" for my tastes: Even if I were to suppose that his reasons are nominally sound, the narrative choice to first show him brutally slaughtering a bunch of generic hero-types (who seemed like totally sane and normal people right until they started talking to the protagonist, at which point they suddenly devolved into dumb bullies for some inexplicable reason) in this way, seems telling.
Of course this could yet turn around right next chapter and surprise me with insightful social commentary, or a reasonably nuanced depiction of the complicated or melancholy mental landscape of a lad who's forced to treat his own kind as the enemy, or, well—anything other than what I'm left expecting after this chapter, which is just "I kill people i don't like, which the plot gives me a lot of, and I have all the monster girlfriends". XD