One of Jonah Goldberg’s readers nails it, I think:
Political thought can be described as a straight line with communism occupying the far left position, fascism the far right.
While I’m in agreement with a lot of its positions I’m not a socialist. For instance, I think some income inequality is probably necessary. And while there are parts of communism that I agree with, there are also parts that I have significant misgivings about, like the relative lack of press freedom and free speech.
There is almost nothing I find appealing or I’m in agreement with when it comes to conservatism.
My own views are pretty centrist. I may lean a little to the left but there isn’t anything extreme about my politics, and besides most of the people I know have similar opinions so I must be pretty solidly in the center.
Conclusion:
If I’m in the center, and can find more common ground with communism than conservatism then conservatism must be pretty far to the right; if not exactly fascist very much in the same neighborhood.
Note the false premises that lead to the conclusion, starting with the very first one (which has at least two — the notion that politics is expressible on a single-dimensional axis, and that fascism is the opposite of communisim on such an axis). Another is that such views are “centrist” (a term that again implies that there is a single line to be in the “center” of).
But as Jonah says, their problem is that they don’t understand their own intellectual history, and most of them think that “progressivism” and “liberalism” (neither of which term really applies to their belief system) started in the sixties, when they think about it at all.