I think the problem is that the sanctity of the 5-Eyes data-sharing was abused. While what you say is both true and also valid, the promises offered were (excus

I think the problem is that the sanctity of the 5-Eyes data-sharing was abused. While what you say is both true and also valid, the promises offered were (excuse the phrase) ass-raped by the US and extremely one sided. Sure, there was a great deal of naivety on the part of the European Nations that were lining up to share the Great Firehose (As you say, 'If you could, Why wouldn't you?'). It is also true that there was a certain amount of 'beers, bribes & hoe's for the bros' involved but I honestly don't think that anyone in Europe ever truly considered that any intel gathered would be used by the US in the way it was.