I want to see a World in which countries, as far as practical, cooperate for the good of humanity - for all the people in the world. That seems to me to give a very good argument for having an organization like the EU. The fact that so much business is multinational, and so many problems (such as pollution and crime) ignore national boundaries and therefore cannot be solved by individual Governments working in isolation gives - to my mind - strong argument in favour of national Governments allowing some decisions to be made at an international level - which again seems to imply that an organization like the EU would be a good thing.
On the other hand, what I see in the EU looks more like almost every country squabbling and trying to look after its own interests, without much thought for those outside its own borders (the response to the current migrant crisis is an obvious example). If that's what the EU has become, is it really a force for good any more? And the recent experience of Greece suggests to me that it is important for national Governments to be able to control their own economies - their levels of economic growth, and of public spending etc. - rather more than is permitted by the free market and the Euro.
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Based on that, I invite anyone to try to persuade me on the merits for either staying in the EU or leaving it