What, if anything, should be done about massive question duplicates?

The questions below seems to have been asked many many times. There is no authoritative answer AFIACT and so, while I know the answer enough to recognize it (I think), it's frustrating to try to find it as a reference as it's buried somewhere in all these different Q&As

What, if anything, should be done? Some even have the wrong answer with many votes as the top answer.

I seem to remember Stack Overflow was supposed to be a place to find definitive answers with the votes helping to surface them, but it seems to be failing in this case. I'm sure this isn't the only example of this kind of issue.

Is there something concrete I should do? Should I pick one at random and mark all the rest as duplicates? Should I pick one that has a definitive answer and mark all the rest as dupes? Should I leave a definitive answer on one at random and mark all the rest as duplicates? Should I post the same definitive answer on all of them and cross my fingers one will bubble to the top so people can actually find the correct answer? Should I just let it go?

• How do I get the coordinates of a mouse click on a canvas element?

• Real mouse position in canvas

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• Getting mouse location in canvas

• Make mouse coordinates relative to <canvas> coordinates

• Getting correct mouse position on Canvas when canvas size is relative?

• How do we get the mouse canvas relative x,y coordinates from an onClick event?

• Getting the exact mouse position on canvas inside divisons

• Get the mouse coordinates when clicking on canvas

• canvas get points on mouse events

• HTML5 Canvas Mouse coordinates

Let me guess ... this meta question is also a duplicate :P