A discussion of the double jeopardy point by the learned Joshua Rozenberg here

http://www.guardian.co.uk/law/2012/jan/03/double-jeopardy-change-law-retrial?newsfeed=true

It will be seen that it could not assist Dobson in any case.

The extent of the evidential contamination was exhaustively analysed in the trial and I see no reason to think that the jury got it wrong. The two unpleasant racists now found guilty were there, and there is no reason that I can see for any significant doubt that they were involved in the attack that included the murder.

I find what Keith is trying to say very opaque. Clarity would assist in evaluation but at the moment it rather look as as if Keith is saying (or even agreeing with "Sam", if that is what Sam is trying to say which would not surprise me) that Afro-Caribbean youths deserve to be killed because Muslims sometimes burn the Union Jack or protest at the funerals of soldiers. I'm sure that is not what Keith means to say but it looks a bit that way.