Depends what you mean by 'credible' - I would think credible means that the questions has a purpose, is not trolling and is not just rewording another question on here.
In the majority of cases I wouldn't bother flagging - I dont see it as my job to flag and clean up the platofrm, and also dont think I have the influence to make a difference (and also it would use up all my VP as there are alot of not 'credible' questions on here!).
I just ignore them - if they are bad questions or repeats then over time they will be ignored/unrewarded and those people will learn that if they want to earn anything on here they need to add value one way or another.
I will definitely forgive. It could be me giving the wrong answer so why should I punish someone for giving one? I believe no one is an island of knowledge so if someone fails to answer a question correctly, the best and logical thing to do is to either correct or ignore and simply move on. There's no point flagging someone over a wrong answer. Just because you did well today, doesn't mean you can't fault tomorrow.
If it is complete bullshit and someone is just trying to mooch rewards then yes flag it. We can not allow musing to turn into the trash heap that steemit trending and hot have turned into. Please do it for us all.
I would definitely not flag anyone over a wrong, not accurate or irrelevant answer, but would let the person know that it's not the right answer.
It happened once, someone has given a totally wrong answer, the user had no idea what was the question about and has gave an answer like a school kid, who does not want to get a bad grade. The user who has asked the question has flagged him/her.
I still think flagging is not the answer. A flag war could get ugly in no time. Giving wrong and not accurate answers can mark a user. I think user behavior can be noted by Musing curators.
I would definitely pass over it. I met hundreds of them and it's simply not worth the effort. Ever since I joined musing I tried to fight spam somehow but couldn't come to any relevant solution. It is what it is. Some people treat this place with respect while some just come and write something in hope for upvotes. If you get annoyed too often by this you will waste too much time on musing with such feeling. Let the curators do the upvoting and flagging. If you want to upvote some good content feel free to do that, but flagging is simply not worth it. There's too much to be flagged and you would only waste your SP. Better channel that SP towards quality posts and support the good.
I just ignore content I don't agree with. The only instance where I flag, is on blog posts where I am easily able to determine plagiarism.
My reason is simple. Just because i don't agree with content, does not mean I have the right to suppress someone's freedom of speech.
It's a collectively agreeable statement to express: Plagiarism is not tolerated on the Steem blockchain, so I am fine with flagging this kind of behavior.
In general, I flag very rarely, because I would rather use my stake to reward users for quality content, instead of wasting it to combat spam that is likely to receive little in terms of rewards.
I would not flag it but would keep an eye on that user. If he/she carried on doing spammy answers then I would highlight it for abuse with musing.
We don't need flags yet but it may come if it requires sorting out. there are enough established users on here to sort most of the accounts out. If musing loses credibility then users will leave and wont come back.