Regarding the 'editing' of Wiki articles:
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"Wikipedia has page histories. So every time you make a change to an article (or most other pages), the old version is still there too, and is almost as easily accessible to a reader or to another editor as the current version of the page.
And so if you do something silly, someone else can easily undo it. We call this reverting, and it's one reason we encourage you to be bold.
Of course it's not a blank check. Some users waste so much of other people's time that as a last resort we restrict their editing. Some pages attract so much rubbish, or are so critical to the project, that as a last resort we restrict editing of them. Some material is so damaging that we immediately and permanently remove it.
But all of these are rare, and again, that's why Wikipedia works."
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Point: 'restrict their editing'.
Wiki can block people. Does.
In other words - Wiki has its head on straight.
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