Jon doesn't make a habit of this, and so pay attention when he does.

Jon Stewart is still an asshole with Kimmel, Maher as well.

For sure. It's just about every twentieth on air appearance Jon Stewart will slip into truth-telling mode. Bill Maher does so way more often than that. But when ideology hits the fan both men are way more Useful Idiot liberal than not; and both OBEY rather than risk their income streams.