A person might be considered a mutant if one's ideology is unlike that of the vast majority of people. All of the established ideology classification systems (such as the left-wing/right-wing scale and the nolan chart) are based upon false, arbitrary parameters, and exclude the rare ideologies, which are the most rightful ideologies.
I have discovered the ideological classification system that is based upon the true parameters, and includes all ideologies.
The classification system is fully described here, with the chart here.
The rare ideologies are the 'substantialist' ideologies.