I came across this meta question asking about the quality of the answers on one of the questions on the main site. After looking through the answers to THIS question I also noticed most of the answers were not really..... answers. They were more guesses.
In my opinion, answers that start with 'I think' or, 'My guess is' should be flagged and removed, as this is supposed to be a Question and Answer site, not a 'Question and Guess' site.
I understand that this particular question would be difficult to give an answer to, however, if the 'I think' answers had provided sources, links, examples or other things along those lines to back up what they were guessing at, then those answers would be much more credible. I have seen this happen before, where people give answers that start with 'I think' and I always downvote them.
Should these answers be allowed to stay? Or should they be flagged and downvoted until they are able to provide sources to back themselves up? Because to me, as it stands, guesses are useless as answers.
I will point out that this question is not to do with this question and its answers in particular. It is in general across the whole site. If you agree or disagree, I would like to hear why.