I've come across some posts on Stack Overflow, both questions and answers, which have been down-voted without any comments, but answers may be ok or good.
Sometimes I've seen somebody down-voting all the answers to a question like a serial down-voter. So I found this link Should a user be forced to add a comment when they vote to close? and I found it helpful.
Same case applies for up-voting also, users don't read the post completely and would up-vote it and these votes (up/down) will decide the quality of the post.
Yeah, I agree that the down-vote can be cancelled out by another up-vote or vice versa, but what if a good answer was down-voted and someone else up-voted it, so that answer's score will be 0 where it should be 1.
So what I actually want to know is whether there is anything (that can be) done to remove unwanted votes after somebody validates it who has a good reputation plus his/hers tags match with that of the post and he/she is not given a provision to validate their own votes, so that we can ensure the quality of the question and answers?
PS : The image given above is just an example not the example