Purism

Sometimes it's easiest to understand a perspective when you hear it from someone who believes it. But no one is a purist. That is, almost no one is solely Platonist, Cartesian, Marxist, etc. To be a purist, you would have to accept one approach in favor of everything else, rejecting even unknown philosophies.

The only possible non-naive purist would be one who can account for new philosophies and make an informed evaluation of them rather than simply rejecting the unfamiliar.