Perhaps the jury was biased, we will never know. I don't think so because no verdict means they couldn't agree. Probably there were some people with very strong views on both sides of what is an intensely polarising issue.
We do know that like every other jury they were picked randomly and had no choice but to turn up and serve on whatever case they were allocated.
It's been a long trial, conducted under intense public scrutiny. Never mind the posters, the jurors have had to walk through protests on their way in to court and at times have heard evidence against a background of noise from the protest. They will have been told to avoid the media but can hardly have avoided knowing that there was a judicial review going on, or that there were big protests and mass arrests in support of PA, or that there were hunger strikes FFS! Honestly I don't know how I would deal with the kind of pressure they must have been under.
And then they come out of this long, gruelling process and face a barrage of appalling things being said about them. People want them named and shamed, they want pictures so they can see what race they are. They want the jury locked up, strung up.
I think people don't want juries, they want scapegoats.
There will very likely be retrials on at least some of the charges and there are several more trials to come for Filton and Brize Norton. There will no doubt be future trials for future offences. Any of us could be picked next time.