Yes. I am German and pro-European and I would happily take a deal that our GDP will be cut 20% if UK's GP is cut even 10% in return. Not to punish the UK, but to firmly establish the principle that leaving the EU is painful. While this might not be the optimum from an economics point of view, it serves to keep the European Union alive - which is much more important in the long run (no more war etc...).