It has been mentioned several times on MSO about downvoting incorrect answers but what is the reason for suggesting people only downvote instead of voting to delete, thereby leaving incorrect answers as still present on the site?
It costs reputation to downvote an answer, so it feels wrong to me that people are punished for pointing out obviously incorrect answers in the hope that they'll be rectified (so they can then remove the downvote if they notice it's been improved) or deleted (so the downvote is then nulled).
Why to we suggest people shouldn't vote to delete bad answers and to only cast such votes for non-answers / spam etc? Do we want StackExchange to be a repository for both correct and incorrect answers?
Yes, I know that the good answers will surface to the top and the bad ones will sink to the bottom, but that only assumes people are willing to sacrifice reputation to downvote - it is possible that such answers will get mixed in with the genuine low-vote answers that aren't actually wrong, just not very good.
Also, speaking as a moderator, why should I not delete obviously wrong answers that have been flagged as such by the community?