Mixing up the two cases is irrelevant. The Firouz case seems wrong, the prosecution of these 12 men also seemed wrong. That prosecution led to the two men fighting their cause and not being deported.
You never test your nerve over laws and rights with easy cases.
Another example: a very very dangerous guy I knew, top top football chap, back in the day when they were genuinely dangerous. The police fabricated an entire case against him, made up evidence, repeatedly perjured themselves in court. It was sick. The guy got a life sentence, life, for a crime that normally merits 6 month terms.
It didn't matter that he was a dangerous guy. It mattered that the police couldn't be bothered to construct a case against him, so they utterly fabricated one. He did just over 10 years.
The police still do this. The Kenneth Noye "road rage" case? Please...dream on...and the media act as narrative for the police/security services...its easy, Mi5 phone some youngster at a desk, the youngster loves it, they use what the security services say as gospel. You can see it all the time "intelligence sources" "police sources"...it's bad journalism...
When you start down the road of "secret evidence" - and normally the police/security services try this stuff where they know they will get popular support - then that becomes a legal principle which could be used against you/me anyone else in the future. Just like "anti-terrorism" laws are just laws now, used against anyone, anywhere...