Barry, I don’t disbelieve you for one moment but I would love to know what part of the country you live in.
Here in the South Island, in all my 65 years I never heard of such a thing. Sadly, putting them in a sack and drowning them yes, but that’s the worst. Having said that, sadly drowning them is preferable I suppose, as compared to releasing them in the bush to fend for themselves, which in turn means the death of bird life.
It’s a sad s world a lot of humans create, isn’t it? 😪