Literary discussion?

[Mark Kohut]

the jacket for SUBMISSION quotes Adam Gopnick ( New Yorker) calling Houellebecq " not only a satire but a sincere ( in italics) satirist, genuinely saddened by the absurdities of history And  madnesses of mankind" 

My question: how does a sincere satirist differ from an insincere one? Only answer I can think of is that it is Effective, real, artistic satire--contrasted with failed satire, not right, not deep, not original. .....
Pynchon's satire is sincere, right? swift's, of course, right?  I thought it was a virtual truism that the best satire springs from idealism ( sincere) showing up the real world's failings. 

Sent from my iPad-
Pynchon-l / http://www.waste.org/mail/?list=pynchon-l