I am not so sure.
Consider our Westminster MPs. You would have thought that they would have not supported the EU as this diminishes their own powers - however - support it they do!
Had it not been for their long history suggesting otherwise, one might have thought that the reason for this would be 'principle'.Clearly, that explanation is laughable.
Ergo, one can only conclude that it is either crass stupidity or a 'lemming mentality' which guides them.
In Brussels how good to see the UKIP MEPs trying to put themselves out of a job. Now that really IS 'principle'.