Good morning
No
The "joy of killing" is based on a very primordial instinct of getting and accumulation of food as muchas as it possible for future time, so there is a utilitarian reason to that behavior. Only Humans kill for no realy beneficial reasons.
I have seen them kill, play with it, not eat any of it and then never come back to it.
It doesn't mean that it was made from evil intention!
And it's normally happens with human bred predators
It is very rare that a wild predators kill and don't eat st least part of its pray!
In the beginning of the salmon season the bear consume the all fish, in the middle they go only fir the eggs and gonads and in the end after they have goarage themselves they eat only the brains of the fish.
So does a bear tgat kill a 12 kg salmon just for its brain that weight a few grams, is evil? I don't think so.