"Conservative" has been the polite term for "Right-winger" for decades, maybe a century or more.

[Metaphorical]

2. Legitimacy

Any militant group - one that advocates violence, subjegation and control as a means of causing political change - seeks first and foremost to gain the stamp of legitimacy, not only to end the status quo, but to become the status quo. This is why these groups so frequently clothe themselves in patriotic symbols as well as symbols of stability: "conservative" being one of the most obvious, but religious fundamentalism works in very similar ways.

BTW, thanks on the origin of radical from radix - I hadn't made that association, but the jump from the Latin radix to the Germanic root now seems obvious, with both of them likely from an indo-Iranian rhud or something similar.