https://www.independent.co.uk/news/long_reads/domestic-viole...
Wisconsin generally allows any land owner to shoot/trap coyote, beaver, fox, raccoon, woodchuck, rabbit, and squirrel.
... that out of the way, there are way too many people who do shoot stuff, and even animals, that they have no reason to and probably shouldn't, for fun. Some may be psychopaths, but I'd bet most are just actual card-carrying morons with poor impulse control. All are best avoided.
I personally would have called out the vet but he’s done it this way, his parents did it this way, his wife’s family has always done it this way.
There are many different ways to live, I am glad people are able to find ones compatible with their worldview, and miraculously we mostly manage to get along.
You can also enjoy this classic comic to help re-align you on how many birds cats kill: https://theoatmeal.com/comics/cats_actually_kill