No it doesn't, it implies deep irrationality. To say that it needs and constitutes a mental illness would mean the impossibility of putting these people in jail but instead we would send them to mental institutions, because guilt is only applicable to rational individuals acting with full capacity and aware that what they're doing is wrong. The majority of fundies are not psychos, or sickos, they're just people who think their interpretation is the truthful one. Grow up. White supremacism and racism aren't diseases, but irrationalities without evidence.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you
