I hope he at least understands those are actual terrorists. Or else he's just killing what he thinks are other chuuni patients for the sake of cool, and that's kinda f***ed up.
Oh i get it now! It's basically a spectacle op mc insert. But he has no idea what is actually going on and is just living his fantasy and being the edgelord he wanted to be
Read the novel for abit... basically, everything falls onto him, while he's acting cool and all, not knowing what's really happening, but somehow it went his way.