Thug killed Kumanjayi Walker while trying to arrest him

A thug with a pattern of violence and cover-ups killed Kumanjayi Walker, an aboriginal man, while trying to wrongly arrest him.

The arrest was wrong because it was based on mistaken identity. Everyone makes mistakes like that, but members of disprivileged groups often learn to expect brutality to follow such mistakes. And it appears that that particular thug enjoyed the opportunity to brutalize someone.