Lexicographer Grant Barrett has pointed out that Daniel Cassidy, author of How the Irish invented slang, is a Humdinger of a bad Irish scholar. Judging by Grant’s detailed review, Daniel uses creationist (or crackpot) tactics: misrepresent, jump to conclusions, fail to look for evidence, and whine about how everyone’s against him:
I challenged Cassidy to present all of his evidence. I told him that I’m the descendant of three strains of Irish, four strains of empiricist, and the son of a bluster-catcher, and I said he was going to have to do better than trot out the same-old “they’re all against me!” argument of every perpetual motion inventor.
Read Grant’s article for a decisive repudiation of what amounts to a collection of folk etymologies.