How to deal with upvoted yet clearly wrong answers
Lately I have noticed a user answering questions using the fast gun in west approach but not verify their answer, the users rep is ~10,000 and the answers usually look legit so passes by might give an upvote or two while the question is hot, by the time it has been noticed the answers is actually not correct the question is not longer hot and others answers generally find there way above/beside it so pointing out it's incorrect generally doesn't do much.
In this situation I will always downvote the incorrect answer and leave a comment saying why but with +2 upvotes and -1 down that user have gets +18 rep and is not interesting in fixing/delete their answers. Most users will fix/delete there answers after it has been pointed out but what can be those that don't, is flagging appropriate here? it generally isn't a problem as the answers won't be accepted but It can have more upvotes than correct answers that are late to the question, I think it undermines that associated trust that comes with high reputation.