You can click the image to enlarge it for readability. Suffice it to say the letter writer is angry that cats kill birds, and urges that cats themselves be killed. Perhaps at $50 per head. Perhaps by drowning.
Tough to imagine anything of the sort being published today, at least anything so brutishly frank.
What is it about cats that incites such hatred in some people? There are folks who don't like dogs, too, but you rarely hear such violent antipathy directed at dogs. Perhaps it's the independence of cats, the aloofness, the fact that cats can take or leave us.
Cats are that way because their relationship with humans is much less evolved than the relationship between humans and dogs. It's as if humans domesticated dogs, but cats domesticated themselves.
Oh well. Those who hate cats simply open the door for those of us who love cats to enjoy them even more.