Rogan's schtick is that he lets his guests explain their ideology without directly attacking it. Instead he has an assistant fact-check any claims they make, and Rogan is also very forthright about calling them out on logical inconsistencies - "you said x just before, now you're saying !x, can you explain how that makes sense?"
The spirit of open curiosity and honest discourse is important. It also gives some ideologues enough rope with which to hang themselves, eg the Milo Yiannopoulos incident.