Aside from the ridiculously crass comparison to Hitler, you are patently wrong.

Hitler was a liar to the core. He framed the Invasion of Poland as a 'defensive war' which he convinced many Germans into believe Poland was actually invading Germany!

He spun deceptions regularly and was known for his ability to convince or make others look the other way while he planned military actions and genocide. Just because he was outspoken about his hate for the Jewish people does not at all make him 'sincere'.