It is hard to digest that there are so many same answers to one particular problem on Stackoverflow, and all of them have received so many upvotes. If now I answer any of those questions, what would be the course of action or what practices will SO follow? I know this question is more points hungry (and it is).
closed as unclear what you're asking by gnat, Ward, Werner, rene, Robert Longson Oct 22 '17 at 7:56
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There's often more than one approach to a problem. Othertimes, people are posting at the same time (and I've often started typing an answer to find a similar one turns up).
Some folk go "eh, I know this" and post an answer similar to an existing one without really reading through all of em - or do read through all of them and do it anyway.
If it's a good answer, and unique, vote as you see fit. If it's a cynical copy of an existing answer, flag appropriately. If it's seriously awesome, and it's your question, and you already picked the 'correct' answer, consider picking.
In the context of SO alone, there's just so much traffic, it's more likely multiple people answer at once, or you get people who chose to answer anyway even if it's answered.
If you want to be a good citizen, only answer if you have something unique to add, that an existing answer does not. Amusingly, I've had excellent luck doing this on some other sites, even months after the original question was posted. It also reduces the chance that someone will assuming you're just going me too, and downvote, flag or vote to delete your answer.