The post you are reporting:
Ah, the 'nomenclature', RM, was not of my choosing, but yours. I quote you: 'the Tories moved further to the right...'. Disavow the distinction if you like (fwiw I, too, think it inadequate without additional categories, and maybe even so with them), but don't then build an argument on it.
It is far from 'true' that opposition parties adopt governing parties' policies in order to appear electable. Whenever did an opposition party appeal to a dissatisfied electorate with the slogan 'Vote for us. We're just like the government'? It at least tries to appear different.
Of course, it's a trick. But I think what you're getting at here is something else, which is that the actual range of policy options (social, foreign, economic) that can now even be discussed (your Overton window) has narrowed to a point at which there is no substantive difference between parties. Everything outside this range is 'extremist'. This is also a point I have made many times. If I have you wrong, let me know.
In addition, I'd say this is not an accidental occurrence.
An 'out & out contrarian'? How I wish it were that simple. However, never one to shun a challenge, I promise to try to ensure that my posts are less open to such superficial readings.
That's 'constructive', don't you think?