Sheesh, is it possible the guy (Hovind) is at least sincere, believes what he teaches, whether you agree with him or not?
Sure, it is always possible that he is sincere. That does not have anything to do with the facts that he is dishonest and wrong. No one has even said that a YEC may not be sincere, we all acknowledge that, but they are still wrong. We can though look at the history of Hovind and see that he failed to report income tax and refused to get building permits. We can see that he continues to repeat things long after he has been corrected.
Certain things, like the age of the earth, are not subject to personal opinion. Anyone who believes that the earth is young is simply wrong. They may sincerely believe they are right, but that does not have any effect on reality.
Aslan is not a Tame Lion