So to balance the argument up a little.
Cameron came back from Brussels waving his "peace in our time" type agreement which was about as worthless as Chamberlain's, and we know what happened after that.
I do admit that in 1914 the public were told it would all be over by Christmas and of course it was not, it was far worse than that.
So we can't believe everything people say and there is uncertainty from both sides. The only certainty is that the Sovereignty that both these humongous events were to protect will be surrendered if we remain in the EU.