Whatever the reason, most authors of these political tracts lack the wit and subtlety of Jack T. Chick. They all make valid points. I agree with Ann Coulter that some of the mockery of Dan Quayle was unfair though I am not nearly upset about it as she is. And I'm sure that many on the left are as Unhinged as Michelle Malkin believes them to be, though I would take her more seriously is she didn't seem so unhinged herself and didn't link to patently looney rightwing nutcases such as the Anti-Idiotarian Rottweiler.
This description by Frank probably applies to them all:
This is a book that scarcely requires an author. You could have assembled it yourself, with an afternoon's browsing of the major right-wing websites and a copy of the collected speeches of Spiro Agnew for stylistic guidance. And yet it stubbornly remained on the bestseller list for weeks. Why?
Perhaps it is the literary equivalent of one of those K-Tel albums from the Seventies: the greatest, most irritating hits of the decade.