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Juries have a history of quirky decision making - there was a similar one in a different criminal damage case where some protestors smashed up a military aeroplane (I think) that was going to be used to massacre civilians somewhere.
There are also nasty cases where certain jurors have alleged afterwards that the decision was reached based on the defendants' ethnicity or a general dislike that they took to them.
I especially like the judge instructed the jury that there is no defence in law for what they did.
Still acquited them.