https://en.wikipedia.org/wiki/Christchurch_mosque_shootings
Wee video here: https://www.stuff.co.nz/national/christchurch-shooting/11195...
Honestly I think our Police do a lot of good. There's some bad apples, there's complaints - but that is normal. Overall, they tend to make good judgement calls (most of the time).
To the defence of the US, sometimes their system does work: https://www.1news.co.nz/2022/11/24/us-jury-charge-police-off... honestly though, shooting a guy in a car that wasn't in immediate danger to anyone else around him (he rung the police originally because he was having a mental health crisis - in NZ you do call the cops if you can) so they shoot him with beanbag rounds, tase him then shoot him six times fatally. A bit over the top...