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The best way to react is to be judgemental. We're using the wisdom of crowds here and you're part of the crowd.
Remember that you're helping everyone by doing that. Why waste the time of all the people who might try the answer and find it leads them astray.
Your power is a single downvote per post, if there are others that disagree, your downvote is easily ...
7
Well, they're both reasonable approaches.
Its worth remembering that you can undo a downvote after an edit (personally) and downvotes are less than an upvote (which can be good and bad). You're also investing some of your reputation for the betterment of the site in some cases since answer downvotes incur a penalty. Both deletion and undoing of a downvote ...
2
A downvote and/or a polite comment as you describe are both good methods to deal with such answers. The consensus on the technical and non-technical sites on SE is leaning towards downvotes as the main method. Adding a comment is often needed when the reasons may not be obvious to all users.
A less frequently used method is to add your own answer. There you ...
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