Oftentimes the answer rated "best answer" is one that was given early on or at a particular time. From the readers point of view sometimes it takes awhile to find a question that a person feels moved to make a comment on. I have found great questions that were posted up to a month or two ago.
Generally speaking I believe most writers enjoy posting a question that garners lots of answers and varied perspectives. Unfortunately there are those who take it personally when someone disagrees with their opinion and in a few instances I've seen situations where a few people have been attacked with negative comments because of a difference of opinion on hot topics.
The asker always has the option to "unfollow" their own question if they are sick of getting email alerts. They can also remove the question as well.