One of the most important jobs we do here is to vote on answers. Good answers are meant to be upvoted and bad ones downvoted. The primary reason for this is so that learners who come here looking for reliable information will know which answers contain reliable information, and which ones contain untrue or false information.
Now, there are many reasons to downvote answers. You may want to downvote an answer because it is too short, does not give a clear explanation or because you feel that that particular answer needs references.
However, it is our absolute DUTY to downvote answers which contain wrong information. Otherwise this site will be doing harm to learners instead of helping them.
There seem to be several answers recently that contain completely false information or give ungrammatical examples to readers, and which have not been edited even after the Original Posters have been advised of these problems. These questions badly need you to downvote them for the benefit of learners and of the site.
Please downvote wildly incorrect answers.