.... PS Oh no! Wait! I forget, a lot of people here are terribly spoilsporty and even litigious, and might view my earlier question as something like "incitement to libel" or whatever. So please don't tell me, or anyone, who this violent ex-con is. Anyway, it's much more fun to guess. Moreover, it occurs to me that (i) if a violent con can contribute greatly to what would later become the OED (as happened), there's no obvious reason why an violent ex-con can't contribute greatly to WP; and (ii) WP's editors obviously include so many thousands of people, and so many oddballs and flakes, that it's extremely likely that violent ex-cons are among them: that there is one among them is really no surprise. So my earlier thrill has entirely evaporated, I'm afraid.