Too late for arguments or discussion now, Brietta. Their xenophobic articles and books will be around for ever, as much a part of history now as Ed Miliband's huge stone slab.
But, basically, both S&S and Finnegan used the Met's claim of eighteen unresolved incidents to tarnish the entire region (and country).
Hardly likely to encourage the Portuguese to welcome a joint investigation I would think.
I have no idea who Finnegan is, so I won't comment on that.
As regards the headline in The Telegraph article, I agree that it is potentially inflammatory for the thin-skinned, but AFAIK it's not normally those who write articles who dream up the headline.
I found the book fair, factual (despite a couple of gremlins that got through the editing process) and well-written. I haven't read the updated paperback version yet and it has been a while since I read the original version.
I don't see anyone moaning about the revelation that the scoping exercise was critical of some aspects of the UK law enforcement agencies' uncoordinated attempts to support the PJ, for example.