Okay, and we allow people this sick to continue to live....why?
And I'm not just talking about the would-be cannibal, but the asshole who answered the ad in the first place, too.
I'd put them both before a firing squad, and probably their offspring, also, just to be on the safe side.
This is what society has degenerated into; people who think that cannibalism is a fucking game, and others who are so shamelessly emboldened by society's apathy to the point of advertizing for potential victims. Is there no shame anymore? Are there no rules to which a civilized society may resort to keep things relatively sane and safe for the rest of us? If you want to point to the seminal event in the long slide into cultural destruction, it was probably the day when the West, seemingly en masse, decided it was a good idea to let the mentally ill walk around without supervision because the process of institutionalism was either bad for their self esteem or too expensive.
Once freed, the Maniacs Amongst Us became free to run for public office, teach in the Universities, unleash mayhem on our streets, and post ads seeking other maniacs willing to be killed and eaten.
Save the gene pool, and the expense of a trial, and and put the crazy bugger down now.