they would place the kittens in a sack, tie a rock around it and throw it in the water....
its not my way, and I couldn't do it...I don't even like to thread a worm...but it was a reasonable practice for some....
Back in my golf pro days, I worked at a club that employed an assistant superintendent that drowned kittens in a bucket (one by one). After letting him know that I would have taken the kittens, paid to have them looked at and eventually spayed and neutered, I stopped associating with him and haven’t spoken a word to him in over 15 years.
I have even seen him in social settings where he would say hello to me and I would simply look at him and shake my head. He knows how I feel and I know how he feels. He doesn’t see anything wrong with it.
I think anyone that doesn’t see anything wrong with it has something wrong with THEM.
I rented a cottage on a farm for many years. The farmer said that is what he did with most of the kittens. (Burlap sack + rock + pond). I couldn’t do it either. He said his youngest daughter thought for the longest time cats only gave birth to one kitten at a time!