There are people on the Leave side of this debate who don't JUST want the UK out of the EU, they want the end of European Union itself. Brexit for them is a first step to that end goal. I accept there is logic in this position, because then all the disadvantages of being on the 'outside' of an organisation that no longer exists will be of any relevence.
This would leave a power vacuum in Europe - and they know this. Could that be their plan?.
The EU was born as the EEC in 1957 (as a development from European Coal and Steel Community, 1951) This was not as soon as the United Nations or NATO, but came as part of the same move towards international co-operation between former foes. Since then it has developed and changed in its nature - what organisation doesn't change from its initial idea? During that time there has never been a hint of a military conflict between its member states. Of course NATO is part of the reason for that, but so is the EU.
Nations that share a democratically elected forum don't tend to fight
Nobody on the Reamain side is saying that war will start the month after an end of the EU, but one major part of the prevention strategy would have gone
Anyway here is a list of wars that happened within or between members states of the EU before they became members. It's inconceivable these wars could happen while these nations are in the EU together. Agreed, the Irish conflict continued within the UK for sometime after membership, but even there friendly relations between the governments of the UK and the Republic within the Democratic structures of the EU played a role in bringing about peace
|1939-1945||World War II|
|1936-1939||Spanish Civil War|
|1921-22||Irish War of Independence|
|1914-1918||World War I|