Re: Since when has "you have the right to remain silent" = "you are a terrorist"
"You haven't had the right to silence since 1994. You don't have to speak, but you'll be considered guilty if you don't."
Not quite. You still have the right to remain silent. But if you go "no comment" in an interview then drag something up in court which you knew but didn't mention during or after the interview, the court can infer adverse things from it.
You will be considered innocent, in the court's eyes, unless there is evidence beyond reasonable doubt that you are guilty. And it's the police service's job to find that evidence, not yours to provide evidence of innocence.
That said, I do think in the case referred to in the article that it's stretching things to suspect the gent involved of terrorism when apparently all he's done is to interview someone with potential evidence of US involvement in torture, in a similar manner to David Miranda's detention some years ago at Heathrow.