Rationalism
The political term for being rational.In a degenerate meaning, the irrational notion that reason should be the only guide and all traditions should be abandoned.
People with such a notion should rather be called revolutionary (in the bad sense); they don't realize that life and civilization rely on so many traditional habits, choices, organizations, and moral rules, that it would be just impossible if people had to think about it and justify it reasonably (if even possible, which is seldom the case).