It's a bit of a shame, but introductions should be properly managed. Do we even know if these are Eurasian beavers in Devon?
I agree, although reading the article really does not indicate one way or the other. If it is accidental escapes …, we have many of those in Europe involving raccoon, mink et cetera, it remains a difficult one.
But once in the habitat and having become established it becomes a bit pointless to call for all out removal. Unless genetic testing can prove that these are not Castor fiber, but Castor canadensis. In which case I would see a reason for (partial) removal.
It seems right now those calling for removal are a fringe lot and a self proclaimed interest group in fishing / angling. Plus … of course that issue of disease-risk is too preposterous for words being cited as the reason for removal.
It is good the Devon WT remains on top here and is in discussions with DEFRA as we speak.
Really, serious scientific questions need to be asked over the beaver as a species for and in the UK: A) habitat quality and availability, B) impacts on environment, C) water quality (beavers improve that …), D) food availability, E) connectivity to other wildlife areas / habitats and F) selection of individuals …. et cetera et cetera.
Devon seems like a good stamping / errrh starting ground to start a serious discussion to bring back the beaver to the UK in my mind. Think of European otter …., which has been part of a successful establishment project thanks in large part to NGO's like The Otter Trust.