[iotku]

>He always prepares a couple of questions in case the conversation stalls

A lot of people underestimate how much effort it takes to keep a relatively smooth flowing conversation for a matter of hours. Ultimately if the words are flowing the host is doing a good job.

In many cases for some of the more controversial guests Lex adds some disclaimers at the beginning, but it's not the host's job to argue every single statement.