Tolerance doesn't somehow prevent white supremacists from forming their own communities or becoming more extreme. If anything, it encourages them to continue doing so, because tolerance is a signal that society will accept their behavior and beliefs as normal, and that there will be no negative social consequences for them, at least until their plans for mass murder become action.
And white nationalists talk to non-white nationalists all the time. That's how they recruit new white nationalists. They're not ignorant of the arguments made against their beliefs - they're well aware, and yet they reject those arguments and persist, because irrational beliefs can't be rationalized out of. Most conspiracy theories would vanish in a puff of logic if that's how people worked.
Simply letting them organize where they will to spread their hatred unabated on any and every available platform, and then only politely and respectfully trying to convince them that their plans to throw the perfidious Jews into the ovens is a bad idea isn't going to do anything but push the Overton window of tolerance for their intolerance in their direction.
And white nationalists talk to non-white nationalists all the time. That's how they recruit new white nationalists. They're not ignorant of the arguments made against their beliefs - they're well aware, and yet they reject those arguments and persist, because irrational beliefs can't be rationalized out of. Most conspiracy theories would vanish in a puff of logic if that's how people worked.
Simply letting them organize where they will to spread their hatred unabated on any and every available platform, and then only politely and respectfully trying to convince them that their plans to throw the perfidious Jews into the ovens is a bad idea isn't going to do anything but push the Overton window of tolerance for their intolerance in their direction.