Isn't it the politicians who make the laws, not the judges - they just implement what the politicians decreed. So if people don't like the law then shouldn't they be having a go at the politicians rather than the judges?
Obviously I wasn't at the trial and I don't think the reasons for the judges' decision have been published, but I don't think that they ruled that it was OK to hijack an aeroplane; they ruled that the original judge make a mistake in assuming that the burden of proof was on the defence to indicate that the alleged hijackers were under duress rather than on the prosecution to prove it. Therefore, the subsequent conviction was unsafe, and it's now up to the CPS to decide whether they would like to retry them or not.