Not for the first time, I recently revisited an answer I had upvoted, and discovered a technical error that gave me second thoughts about the upvote. I don't want to mislead new readers into believing I endorse the incorrect answer. But the software will not let me unvote, saying my upvote has been "locked in."
Of course, in the future I should be more diligent in carefully checking all answer before voting on them. But it would also be nice if I were allowed to correct my mistakes.
What is the point of this feature? Another meta thread from years ago (http://meta.math.stackexchange.com/questions/861/locking-in-unvotes) says this behavior is to stop "tactical downvoting" but I don't understand the disease, or why is needs such an annoying cure. I propose removing vote locking from math.stackexchange; what are your opinions?