Semantics.
When I saw that cat behave the way she did, there is no better word than “evil”. Luckily she wasn’t constantly attacking, though.
As far as the silly mouse-playing thing, now you are projecting your morality on the natural behavior of an animal, and I doubt cats are the only ones. Not that I really care, either. None involved is human.
I really don’t think you should be throwing any “projecting morality” stones.
I find your ‘semantics’ interesting.
“The silly mouse-playing thing”??
Silly?
The cat tortures in jest but the mouse suffers in earnest.
Animals are amoral creatures.
They cannot sin.
They cannot commit acts of evil.
Anthropomorphizing them is wrong.