User blog comment:FishTank/Becoming a good wiki citizen/@comment-26517310-20180617072021

We had a horror story recently. Had an editor who seemed to be knowledgeable in the subject area. Started filling us up with all sorts of useful material. But he didn't like our structure or look and feel, so he started to change them. Renamed all our templates t match his preferred style. Restructured a load of pages according to his preference. Poured stuff in without a thought to where it fitted. Performed major refactoring tasks. And never actually finished any task he started.

He refused to mend his ways, because he believed his ways were better. And as he was a big name on another forum (Stackexchange, I think it was) and was also fairly deeply involved in Wikipedia, he knew he was so much better than any of us.

We blocked him, inviting him to justify his position regarding a bunch of specific points on which he was challenged. He refused to do so. He hasn't been back. We haven't yet drowned in the floods of tears as a result.