> “At least in that aspect” is the key.
>
> But not in others.
So? Since the center is not defined by the mean it doesnt matter. Even if europe had every single political party ont he left it would still be the left. The center and right would be nonexistant but still ideologically fixed.
> It’s hard to say whether a particular political party under one system is to the left or right of a particular political party in another because the answer usually depends on your metric. In other words, it can be to the left in one sense, to the right in another.
Its not hard to say at all, it is quite simple in fact. I laid out how one could think about it and apply it.. If the party focuses on regulation in an attempt to minimize natural power dynamics occuring, then they are ont he left. The more such regulation they promote the farther to the left they are. Two parties have the same relationship on this scale regardless of what system they are in.
> You might think that extremists would be an exception: UKIP, for example, is obviously to the right of the DNC, but then you find that UKIP supports the NHS (at least for “real” Brits), whereas even the tattered echoes of the moderate right in America oppose ACA, much less M4A.
Extremism is a different matter. Where the line is where a group might find an idea fringe is absolutely relative and a matter of opinion. The center however is fixed and not relative.
Its like the number line... how big a number has to get before it is "large" is a matter of opinion and relative to the context. But 0 is always 0, and always the center of the real number line.