In past, several times I saw that, when a meta question is asked in yes/no question format, those whose answers are "yes" up-vote the question, and those whose answers are "no" down-vote the question. When the question is not asked in yes/no format, people rather vote it more likely by its quality.
For example, if you ask your question in the following yes/no question form
Should every answer contain a reference from an outside source?
if people oppose the idea, they down-vote the question.
But, if you ask the question like
What do you think about the necessity of outside references in answers?
The trend of the up/down votes change dramatically.
What do you think about this psychological phenomenon? Do you think that all users truely understand the purpose of voting (especially the purpose of down-voting)? Some people behave like they are on Facebook, and they become very happy with the "dislike" button they find here, which is missing in there. I know, there are tool-tips giving information when you however your mouse on the up and down vote buttons. But, maybe we should display a larger and more vivid panel which include more information about the purpose of voting, at least for new users.
What else could be done to solve this problem of different voting for same two questions which have the same meaning but written with different words?