There's a fundamental difference between supporting someone, and supporting their *rights*. I wish Muslim women didn't wear Burqas, or Niqabs, or whatever other items of clothing it is that serves as a reminder that, historically, they were seen as being best "cut off" from society at large. But as long as it is their free choice then they always have the right to make it. This doesn't change, either, because they have allegedly committed, or conspired to commit, a crime.
In courts of law, perhaps, it's less defensible. Thankfully Barmaid's covered my concerns for me. They still have a right to wear this in court as long as it doesn't interfere with being identified, or in the witness stand. And at that point, if it starts to interfere with justice, I would stop supporting their rights, because they've then been superseded by far more important concerns.
But until then: I don't support them for making this choice; I don't support the choice; I don't support their behaviour in court; and I certainly don't support their alleged intentions to stab people. I do support their right to choose what they wear.