Domesticated rats are not my favourite creatures but I don't have a problem with them. But if I see one of those big mutant canal rats someone near me I would scream my lungs out. The feeling would be unspeakable, I don't even wanna imagine what it would be.
This is why I have a cat. So she will and has brought to me the dead corpses of several.
And she doesn't stop there, that large and limber kitty of violent and obligate carnivorous nature, she would kill birds, rabbits, moles, chickmunks, squirrels, and even the indigenous and harmless fruit bats that would be about. She would have the half-eaten corpses rot at our porch. It's practically a chore to clean it all up. If anything I have an idea to feed my future cats in this manner, to get feeder mice and let them act on their hunter instincts and fashions.