Both have addressed the "posing nary a critical question" question. Yes the guests say what they please, as long as it is not going to insult the audience. Both have terminated guests and on a few occasions there has been turmoil off air. I started listening to Bell about twenty years ago before UFOs.
But here's the important part. Few guests are crackpots. Some deal with outside the mainstream stuff. But! A large number of guests are mainstream reporters, businessmen, scientists, educators, etc. and they are on for three hours usually -- not ten or fifteen minute sound bites. If you can / have to stay awake at night most shows are worth it. IMO.
(Ummm.... Not as America's most wanted BTW)
Have yet to be on "Coast to Coast". - Guess I still have not made the "big time"! Sigh.
LOL!