In that case Kevin all these "co-operating" extremists must be very poor students of history and on a very shallow learning curve because their track record to date is that they have not succeeded in driving anybody apart yet - in fact quite the reverse.

Possibly not in the island of Great Britain, so far. But sadly there are only too many examples demonstrating the reverse. You don't have to go too far to see how it happens, in the recent history of Ireland. Then there are the states of former Yugoslavia, the Holy Land... too many examples of this process to enumerate.

And no, I'm not suggesting the extremists sit down and work it out in advance. But often they might as well have.