@RobertLongson So you mean 'This answer is not useful' is simple reason but in what case? Answer is provided as per question asked and it was well accepted by lots of people. Might be case that he have different issue

@RobertLongson You are not getting all cases, I got down-voted for my answer in bounty question by same user who answered for that question. I lost bounty award just because this strategy got played. So I asked about this.

@RobertLongson Well I suppose you have an answer for my question asked now in earlier comment

@ray: "I got down-voted for my answer in bounty question by same user who answered for that question." How exactly do you know this? Voting is anonymous, so how do you know that the downvoter was the poster of a competing answer?

@NicolBolas I appreciate your question and up/downvote given. But it was pre-assumption of possible case which cannot be detected, mentioned at meta.stackexchange.com/q/322232/447465

I am developer so I do not work with morality('do not take downvote personally'), I deal with edge conditions which made me ask this question

@ray: But you wrote about it like it was something you knew happened specifically to you, not a "possible case". Indeed, you specifically said "I lost bounty award just because this strategy got played." So I ask again: do you know that this happened to you, or are you merely suspecting that it happened?

@ray: "I deal with edge conditions which made me ask this question" A good developer only deals with edge cases only to the extent to which they actually matter.

@NicolBolas Sorry for my previous words if I went in wrong direction to explain thing but there is such a case present

@ray: You still haven't answered my question: how do you know "there is such a case present"? Not merely that it could happen, but that it did happen.

@NicolBolas for bounty amount I was going to downvote competing answer to my answer and gonna win half amount but I did not because my ethics did not allow. So my ethics won but it is not same with everyone

@ray: OK, simple question: you said "I lost bounty award just because this strategy got played." Did that happen to you? And if so, how do you know it did? Answer the questions; don't sidestep them.

I kept example and you struck on it, you do not want to consider case then I cannot help

I want to know whether you told the truth or not.

You effectively claimed that someone on our site wronged you. I want to know if that's true.

And if it is, how you know it's true.

Everything has to start with the truth. You cannot and should not use lies and fabrications to achieve some end.

okay I thought you are pretty intelligent because you know policies of SO so no one can know who downvote him and later I told it is case which can be possible