:I think the available tools are too clumsy. Remember that someone can walk in off the street and make any change and never be seen again. Of course, you can revert that. And people who have a Wikipedia identity may drop in and change things, and you can revert that, with an eye out for edit wars. But the Wikipedia structure can't do much about limitedly obnoxious people; it can only take very slow and cautious action against monsters; and it may not always get that right. 

 :Once upon a time I subscribed to the Wikien-l mailing list, and I saw a number of complaints and counter-complaints there about people who were abusing articles, and I don't have a good feeling about Wikipedia's ways of keeping order. With that and my experiences on my pet page, Galileo, I get the impression that there really is nothing to do except keep eternal vigilance if one cares enough; otherwise, try to avoid the subject. You've started in the right directon with comments in the Talk page and in the source text. BTW here's a habit I've learned: when an old familiar bad change is made, compare the versions using the History feature; and note that the contributor's name is accompanied by a link to "contribs"; follow that link, and see if this lloks like a one-time poster (or a vandal) or someone who might be serious; handle your reversion accordingly, since people who come back and see that their stuff has been reverted may get resentful, but most posters never come back. This is a nasty bit of manipulative politicking, perhaps, but as Madison said (very approximately), if men were angels there'd be no need for politics.