What do you think of me letting my cat shred my sisters sweater with its claws?
Why didn't you stop the cat from wrecking her sweater?
I like to see how much she'd care about that horrible cat destroying her stuff.
Are you mad at your sister or the cat? Either way, letting the cat ruin her property is no way to deal with conflict. You need to control your cat and resolve conflicts constructively.
Okay I don't think the cat did it on purpose. I can fix all this.
I am glad to hear you will make a plan to fix this. Your sister will be pleased and relieved.