It seems both absurd and ignorant to me to suggest that an obligate carnivore
is practicing unwholesome kamma by hunting food, as evolution programmed them to do instinctively. As far as volitional behavior goes, some cats form caring relationships and practice wholesome behaviors, if it's in their nature. And some cats are evil and hateful little demons. Wide variety of personalities, just like humans. The life of a stray animal is hard.
Humans and other omnivores
are fortunate to be able to choose their proteins. personally, I wish I didn't have to eat at all--it's an inconvenience, and I dislike the expense too, but well, there you go.