What changed David Cameron’s mind?

In a recent speech at the British Museum, David Cameron implied that Brexit could lead to war:

“Can we be so sure that peace and stability on our continent are assured beyond any shadow of doubt? Is that a risk worth taking? I would never be so rash as to make that assumption. Britain has a fundamental national interest in maintaining common purpose in Europe to avoid future conflict between European countries. And that requires British leadership, and for Britain to remain a member.”

This suggestion is the latest in a series of stark government warnings against Brexit, dubbed ‘Project Fear’. This warning is difficult to believe because only a few months ago David Cameron was saying the UK could “thrive” outside the EU. If Cameron now wants to argue that Brexit would mean Britain’s ruination he must show what has changed since then to make him change his mind.