Russell Kirk, arguably the best conservative intellect of the 20th century, wrote often about being on guard for ideologues. His admonition was offered because he recognized that far too many people who seek public life do so for power and not service.
An ideologue is an individual who conducts political action and activity to gain political power so as to suppress or eliminate those who might hold contrary views. If one thinks about the establishment class of both political parties, one can easily identify those who seek power at the expense of service to constituents. I have seen this up close.