Making people agree with you
If you have some opinion and you want that other people agree upon it, it´s better not to tell the opinion directly, but rather to minimalistic influence them to reach that same opinion. In this way, they will be proud of it and fight for it.
Otherwise, if you tell the opinion directly, they will be probably against you. It´s just a matter of fighting for power...
Of course, the minimalistic influence method has the disadvantage that you don´t receive the honors for having the idea or the opinion... But when you want to get things done or agreed upon, it´s sometimes worth paying this cost.