On what do you base this. I just skimmed the treaty [0], and it seems completly symmetrical. It even has a clause allowing a nation to not extradite when the death penelty is involved, which I believe was included as an anti-us provision.

The only special consideration I found for the us was defining "Competent Authority", which is left undefined for the other signatories.

[0] https://www.congress.gov/treaty-document/108th-congress/23/d...

I guess I would consider that an opinion --though of course rationally it makes sense-- without evidence that the UK officials who agreed to the treaty were intimidated into signing it due to a fear of violence (actual or financial or...) towards the UK from the US. My opinion is that the sort of people who signed the 2003 treaty were not particularly concerned about preserving civil rights for British citizens, and the 2003 treaty did normalize evidentiary standards between the two countries that had been lopsided in the UK's favor since 1870.