SV's aren't to the "right" of non-SV's, they are simply Catholics who have formed an opinion regarding the legal membership of the Roman Pontiff and the Bishops in the Catholic Church.
They are considered to be to the Right. The Right/Left paradigm is a way in which people orient themselves in relation to others. There is no doubt in my mind that sedes are considered generally "to the right" of non-sedes, and it is legitimate in that sedes stand for more coherent and traditional view of the papacy than non-sedes.
As Mike said, the "right-left" paradigm is a novel, intellectual construct that stems from the notion of "extremes."
No, it has to do with political orientation. Whether you like it or not, you are oriented politically because of your religious convictions. It's quite evident that SSPXers tend to be more "moderate" (open to liberal/"conservative" clerics) than sedes.
An opinion is either true or false, and as such is not susceptible of directions, except maybe up for heaven and down for hell.
That's certainly true, but it's false to say that therefore there is no political spectrum. The positions can act as political coordinates - and one dimension is undoubtedly whether one is "pro-revolution" or "counter-revolution." Pro-Christian or Anti-Christian.
The existence of a spectrum of opinions "pro" or "contra" is to be expected in all contests where politics comes into play.
Such language always implies the orator who uses such language to be in the perfect center, the standard-bearer, the firm column in the middle of two poles, which of course, in the end, is always "moving."
No, it doesn't imply that at all.
It is ridiculous terminology unfit for Catholic usage.
So we should never use the political spectrum in discussions? That seems like a rash conclusion.