Die-In and Vigil at TfL HQ. Public

But it's fine if you aren't keen on segregation. I can't see how it wouldn't improve the experience

Is there somewhere I can go to read a coherent argument against 'go dutch' / copenhagenize plans?

The coherent argument is as I see it simple: taking cyclists off the road will reduce drivers' respect and awareness of them to zero. You'll end up with worse drivers, and worse cyclists, as a result.