Fairness and guaranteed output delivery Why for achieving the fairness and guaranteed output delivery, less than a half of the parties should be corrupted? ($t &lt; m/2$, where $t$ is the number of corrupted parties and $m$ is the total number of the involved parties)

Would you please prove it intuitively?
Intuitively anything the honest minority can do the dishonest majority can do as well. So if the minority can force a correct outcome the majority can force an incorrect outcome. 

Side note:The question is ill-defined, not mentioning a specific problem where these requirements are to be held, is this a computation? who has the input? In some situations we can deal with a dishonest majority such as limiting them to no more than failing the process.