It’s really really stupid for someone with a huge audience to bring on an anti-vax nut job and uncritically interview them because simply being on the show at all lends their message legitimacy — “this person who I trust to curate content says this is a voice worth listening to.”
The message isn’t “you shouldn’t be allowed to listen to their viewpoints” but “what the fuck Joe, you basically endorsed these idiots and people actually listen to you.”