Do you think that Ken Ham actually believes what he says he believes? I suspect creationists like him to be conmen, I find it very hard to believe that they actually mean what they say.
On the other hand, I know a creationists who studies biology and who is very active in spreading his ideas of a young earth, who I am quite sure is sincere. His personality is extremely competitive and fanatical (he loves to play games and he is that guy who is obsessed with learning everything about the game and doing everything to manipulate his opponents) and he is from a very evangelical family (his sister is also a very active christian leader), so I think he has been thoroughly brainwashed when he was young, and giving up on something does not seem like an option to him. When I was a christian I have actually been to some of his lectures and I remember him discussing the sedimentary layers with all the fossils, and that it really is hard to deny that it is evidence for evolution, but that he had some alternative theories, which he admitted were weak, but he said that <b><i>even if all evidence points towards evolution and none at all towards creationism, he would never change his mind, because the bible says the earth is young</i></b>. I admire him for being so honest, but, man, I was completely shocked by this statement. I never went there again, it was completely obvious that this guy was not intellectually honest. He did not deserve his university degree in Biology.
On the other hand, I know a creationists who studies biology and who is very active in spreading his ideas of a young earth, who I am quite sure is sincere. His personality is extremely competitive and fanatical (he loves to play games and he is that guy who is obsessed with learning everything about the game and doing everything to manipulate his opponents) and he is from a very evangelical family (his sister is also a very active christian leader), so I think he has been thoroughly brainwashed when he was young, and giving up on something does not seem like an option to him. When I was a christian I have actually been to some of his lectures and I remember him discussing the sedimentary layers with all the fossils, and that it really is hard to deny that it is evidence for evolution, but that he had some alternative theories, which he admitted were weak, but he said that <b><i>even if all evidence points towards evolution and none at all towards creationism, he would never change his mind, because the bible says the earth is young</i></b>. I admire him for being so honest, but, man, I was completely shocked by this statement. I never went there again, it was completely obvious that this guy was not intellectually honest. He did not deserve his university degree in Biology.