Here in the U.S. We take courtooms VERY seriously. You can be ejected or imprisoned (contempt of court, holding cells, not "real" prison -- held until you pay a fine and/or apologize to the judge personally) if you pull such a stunt.
Why? Because it's an implicit threat against the jurors. You've just tainted the effort that went into picking the jurors... Now they're being documented? There are too many times where somebody tries to strong-arm a juror, or find out who they are and threaten their family, or whatever.
These people have to feel like they are safe to perform their duties, and are pulled from the public at large.
It's not as much about photographic rights in courtrooms here in the U.S. as it is a lesson learned in preventing damage to the system as a whole. You can't do it. This is why it's a big deal in high profile cases to allow cameras or close-circuit TVs, and so forth. You'll find more artists with pads and pencils sketching than you will photos (at least going by the stereotypes -- this will change from courtroom to courtroom).
I'm glad some of the nutters are realizing that photos are no real threat and that public places should not be restricted, but there are some areas where it is restricted for very practical safety-related reasons.
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