U.S. says North Korea killed Kim Jong Un's half-brother Kim Jong-Nam with chemical warfare agent VX

OK, so sovereign state killed one of its own citizens and why do we care about this? The U.S. averages about 35 executions every year. Is it the manner? Is using a nerve agent on a single person any worse than dropping a bomb from a drone on a wedding party?
I know this may seem like whataboutism but seriously, do we have a leg to stand on morally here?

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