Earlier quoted context omitted.
> editors have gotten into turf wars over articles they feel some sense of ownership over That's exactly what killed my one and only attempt to substantially improve an article (not just typo-fixing and stuff): The two guys with a lot of edits on that page couldn't stand someone else editing "their" article. Sure, they tried to bring up superficial disagreements about the content, but that could have been resolved tr…
You fix it by social engineering. If you go in and blam an entire page, no doubt the original authors will cry foul; it probably took them a fair amount of time, even if what they wrote wasn't particularly good. It's also fairly rude without at least giving them a chance to improve sections. Incremental editing will also give you a far stronger case when they get arsey, particularly if your inclusions are better than…
To me, this only furthers and enhances problems with ownership. If my first approach to "collaborative editing" is "give the original writers a chance to improve" rather than "collaborate" and "edit", then it only enhances the perception or "reality" that that article belongs to them.