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It is not, "Why it's right to stay in the EU?", but "Why it is right to be in the EU!"
It is a mistake to continue talk of such matters as a semi-bystander. The EU is not a mere convenience, but a necessity. It is a nonsense also to heave an imagined sigh of relief that we were never a part of the 'single currency'.
The collapse of the Euro is as much due to we distancing ourselves from it, carping and gloating...and profiting.
What is missing from all retrospective denunciations of all things EU, is any real willingness to play a true role within the EU.
Had the UK chosen, at any time in the past thirty years or so, to be wedded to the EU, and not remained little more than its coquettish mistress, things would indeed have turned out entirely differently.
The UK has no place to be relieved, thankful or grateful, that we have for so long stood apart from mainland Europe. Had we the courage to recognise that the channel is naturally narrower than the 'pond', and had accepted that our National fortune is better allied with Europe than the USA, this whole financial crisis could have been avoided.
But no, successive UK Governments, for reasons best known to themselves - and each other, have continued to find common cause with the very worst that America has to offer.
We have long been, and (seemingly) wish to get back to being, the supreme Double-Agent, the Mata Hari, (nay, the Gangsters Moll) of Global Intrigue, the flexible-friend, the sinuous-serpent:The Worm of the Western World.