[bloak]

I would guess that to most of the world's population "prohibition of the use of illegally obtained evidence" is a crazy and stupid idea. Apart from the USA, which countries have a rule like that? (Perhaps Germany does?)

I'm not saying the rule didn't serve a useful purpose in some particular historical circumstances, but in general if you know that X is true then you should use that fact to avoid miscarriages of justice, and if crimes were committed in establishing the truth of X then you should hold a separate trial of the people responsible for those crimes (unless of course they are dead or for some other reason cannot be tried).