Only in the Politicians view, the Public will want scapegoats from among their ranks, they won't blame themselvesThey are as ever self-serving. If they vote against Brexit, everything that goes wrong with the economy subsequently could and often would be blamed on them.
On the other hand, a failed economy after Brexit would be the public's fault for that decision.
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"We have been betrayed! " will be the cry.
If the can't see that coming they are stupid.