Addressing your points:
this answer is wrong, but it has too many downvotes, so I upvote it
Please, don't do that. Up-voting purely for sympathy not only skews the usefulness of voting, it gives reputation that wasn't there. Down votes cost the author 2 rep, up voting rewards 10. By being sympathetic, you're giving them 8 rep that wasn't there before.
this answer is correct, but IMO it has received too many upvotes
Please, don't do that either. It's the reverse of the above with the same initial consequence.
While your votes are your own, they help more when you cast them based solely on the quality and technical merits of a post. They become unhelpful or even harmful if you cast your votes based on:
- The author of the post
- The amount of votes a post has received
- Any other 'meta' circumstance surrounding the post
- The phase of the moon
Our job as voters is not to run some kind of 'adjustment bureau', it's to ensure the best quality rises naturally to the top so it's quickly found by people that need it. That's precisely what voting is designed to accomplish, so please keep the end in sight while considering the means.