What should I do now that my brother wants to be a hit man?

My brother seems obsessed with becoming a criminal. I took your advice and simply ignored him when he said he wanted to be a prostitute, drug dealer and a con man, but over Christmas he told me he wants to be a hit man.

I asked him why, of course, and he said he's always thought about what it would be like to kill a man, but he could never find a reason to. Now he says the best reason would be money. I asked him how he would get into it, and he told me he's going to put out an ad on Craigslist, and hopes that people will find him on there if they need to order hits on people.

I told him this was a terrible idea for multiple reasons, but he assured me it would all work out because he'll be using a fake name. He's also going to use a disguise so he looks nothing like himself, something about a prosthetic nose and a cap to make him look bald.

Should I continue to ignore him since this probably won't work out, like his other aspirations?