Varieties of criticism
Conservative criticism has nothing much to do with "left-wing" or "right-wing", because left-wing people are often very conservative, in the defined sense, while right-wing people can also be very radical, in the defined sense. The difference between "radical" and "conservative" has more to do with the belief in whether "a change to something genuinely new" is really possible and necessary. Radicals typically believe strongly that such change is highly desirable and necessary, and that it can be achieved. Their criticism is that there is "not enough" change. Conservative critics, by contrast, are very skeptical about any such change, because they feel the change is really "just another form" of something that already exists.
Left–right political spectrum
A number of significant political movements—including feminism and regionalism—do not fit precisely into the left-right spectrum. Though nationalism is often regarded as a right-wing doctrine, many nationalists favor egalitarian distributions of resources. There are also "liberal nationalists". Populism is regarded as having both left-wing and right-wing manifestations (see left-wing populism and right-wing populism). Green politics is often regarded as a movement of the left, but in some ways the green movement is difficult to definitively categorize as left or right.