On Programmers, thanks to the shiny new badge no doubt, dozens of tag wikis were suggested that directly copied Wikipedia and Stack Overflow's tag wikis. This violates the attribution requirement of the CC-BY-SA license, and generally makes for a really crappy tag wiki.
Someone with approval access to the suggested edit queue approved these en masse without checking to see if the content was plagiarized or copied. This presents a problem, as we can't have plagiarized or copyright-violating content on the site.
Unfortunately, what took the approver about 2 minutes to do can't be easily undone: we have to go back into each tag wiki, blank out the full description, and come up with a dummy tag wiki excerpt (since you can't save a tag wiki with a blank excerpt).
This is—for lack of a better word—insane. I get the value and draw of having low-friction approval mechanisms, but there needs to be a way to easily roll it back when people get it really, really wrong.
Please, think of the children mods: don't let bulk approvals exist without an appropriate bulk rollback mechanism.