Anat Hoffman wasn't arrested for carrying a Torah scroll. She was arrested for disturbing the peace. The secular Israeli supreme court (not a religious court) ruled that all prayer services that are not status quo, MUST be held at Robinson's Arch which is itself part of the Western Wall. Every month the Women of the Wall group tries to defy the supreme court ruling for their own political agenda and Anat and others have been arrested a number of times for disturbing the peace. If their mission was in the interest of praying and spirituality they would accept the supreme court ruling and there would be no problems. The fact that they cause a ruckus every month and prefer to get arrested and make headlines is proof that this is for another agenda.
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from the article: Police arrest Women of the Wall leader for praying with Torah scroll