They found bullets which he inscribed 4chan memes onto. Including a very specific "Groyper War" reference.

His father that was the one who reported him in the first place said he hated Kirk for "not being conservative enough".

.....You all think the idea of Nazi infighting is so weird because you were taught that America swooped in and saved the world from Nazi Germany and not the reality that the Red Army and the Nazis murdering each other to rise through the ranks took out half the Nazis by the time of D-Day. But I assure you, infighting is baked right into the ideology of fascism. Even IDF soldiers are prone to "friendly fire". (Although with them it's likely just incompetence.....)