If anonymous reports are NOT accepted, then in this age of the Patriot Act and John Ashcroft it could put discussions of any kind of serious direct action off limits. Reports on almost anything beyond a march in the streets could not be safely posted, and the whole enviro/animal rights community might be unable to effectively use this board in the fact of such things as the Portland JTTF.
Remember, not every group doing direct action has a press office thaqt can "sanitize" reports on actions that might otherwise go unnoticed except, of course, by the target. Reports on sucessful direct action do a lot to boost morale and encourage others to take up the tools of resistance. These days, so much as smuggling a banner into the US Congress, setting it up on a timer, leaving the building, and having the banner deploy after you are safely out would be enough to place an identifiable claimant at risk for prosecution.