Hm. I can sort of see a use for the phrase if one's laying out a list of possible opinions, interpretations, arguments, etc. Even then, I'd be more likely to start off with 'Some people believe...' and keep on using that to signal the start of a new argument. Of course, it also works better if one can name actual people or groups who have stated publicly that they do believe whatever it is and provide details about why they believe that.