IJin is literally in "berserk mode", after realizing that the family of the diplomat who took him in was killed (the diplomat's scientist husband is "dead inside").
And between you and me, killing some paid sycophants who support chaos-makers is perhaps comforting. Imagine if IJin could stop a war with that? After all, the numbered ones are working against an arms dealer.
(Why does Google Translate translate "trafficker" as "dealer"? - In Brazil, the negative term for "obscure/illegal dealer" is "traficante"...)