During a question on SO, whilst the question remained somewhat ambiguous a potential answer was downvoted. No explanation of the downvote was made to the poster, nor was there any reason for that one answer to be singled out.
The answer had a slight flaw in it, but at the time numerous answers had a slight flaw - there was no real justification for it. I placed an upvote to return the post to zero - I felt that the downvote was unwarrented and not constructive / supportative of someone who was contributing in a positive manner.
The question is - is such a tactical upvote to counter a harsh downvote, and continue to encourage people right or wrong?
To put additional context / remove a conflict of interest - my own answer which had two upvotes was actually incorrect in the end, the best answer had a score of zero so I also voted that up and then deleted my own post to ensure the best answer was highest.