Jimmy Wales, the founder of Wikipedia, had an article in yesterday's Wall Street Journal drawing attention to the rise of "online hostility" and the "degeneration of online civility." He (and coauthor Andrea Weckerle) suggested ways in which we can "prevent the worst among us from silencing the best among us." I agree with just about everything that they say. But there is one problem that Mr. Wales does not go near. That is the use of Wikipedia itself to inflame the political debate by permitting activists to rewrite the contributions of others. All by itself, that surely is a contributor...