They are literally counting on you to see them as normal and worthy of human respect, their behavior as "politics," their style of "debate" as genuine. They don't care about convincing you, what they're trying to do is create space for their methods to function. You cannot "win" by participating in EXACTLY what they want you to do. Don't take my word for it, Goebbels himself said this shit once the Nazis took over. They use your rational "liberalism" as a weapon against you; on purpose.