When opposites unite

There is a political theory that the political spectrum is not so much horizontal and linear as a circle and the extremities of left and right are actually very close in spirit.  How else would Irving Kristol go from arch-communist to neo-conservative?
In this vein, what do Islamic extremists who protest at military memorials and Nigels Farage's UKIP have in common?  Burning the Union Flag!  One of the campaign posters for UKIP has the British flag consumed with flames from the centre to reveal the European Union flag and the unproven assertion ("it's a figure we have estimated," said Farage in the first debate without providing any methodology) that 75% of British laws are made in Brussels - without references, some might call that a lie.