Like here Django: How to check if the user left all fields blank (or to initial values)? where the only correct answer is provided by the OP.
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If an answer is wrong, you can do three things:
If you blame SO for wrong answers, remember that SO is a communtity, and you are part of it. So better try to correct a wrong immediately.
Besides if somebody asks: what is 2+2, and 5 is given as an answer, it can get lots of upvotes, but it's still wrong.
The other answers don't have a negative score, so perhaps they're not "obviously wrong". Besides, answers can be upvoted for being helpful or whatever else without being perfect.
If you think they're bad and not useful, downvote them or and/or leave a clarifying comment. Most posts with huge negative scores get removed by their authors.
Moderators may not be experts on every specific subject on the site, so they don't delete posts based on whether something is wrong or right. Voting is supposed to fill that gap.
There's a difference between wrong answers and answers that aren't what you're looking for. I haven't seen many (any?) flat out wrong answers. If you do see an answer with inaccurate information, comment so and consider down voting.