To keep it short, people think he's lying about where he says he went wrong. Because his reasons aren't internally consistent. He either used a piece informati

To keep it short, people think he's lying about where he says he went wrong. Because his reasons aren't internally consistent. He either used a piece information to justify his already held stance. "I don't believe in climate change. This politician says it. Politicians lie. I can continue not believing in it." Or he allowed certain affiliations of his to dictate which groups he should dismiss despite any actual evidence. "I work in oil and gas/I am a Republican. This would be bad for my industry/Democrats are mostly in support. I shouldn't support it." Neither of those are good processes. And no one wants to admit to either of them because they are bad. So if something like the above is the reason, it's best to try and claim another. But enough people are savvy enough to put two and two together.