Because it feels so good. LOL!
My husband had a medical crisis last month. Now my probable NPD BIL thinks he gets to make medical decisions for my husband. Nope. Not even. We have "living wills" and "Medical directives", and have had them for 15 years. His name is not on any of them. But does that stop a narc? no. So anyway, last Monday, my BIL calls and asks how DH is doing. I tell him he's doing good and volunteer that he started physical therapy. So far so good. I do MC with him generally. So then he asks me about a caregiver for my husband and I tell him it's not needed. It's not. My husband is NOT an invalid. He can't drive right now. He also doesn't shower unless I am here with him to be sure he doesn't fall. But he can heat up leftovers or soup. We have close neighbors he can visit. He has friends who will come get him and hang out. MY BIL starts to argue with me. I tell him firmly it is a private medical decision between my and my husband. He then says (are you ready for it?) "NO! it's a FAMILY decision!"

Instead of JADEing with him, I hung up. And he hasn't called back.
See folks? I Have learned a thing or two about a thing or two from this place. Don't JADE with narcs.