I think that is also because as a Junior one thinks that he should have opinions and be vocal about them and be right to further their career or to become Senio

I think that is also because as a Junior one thinks that he should have opinions and be vocal about them and be right to further their career or to become Senior/Manager/Leader. Just like getting good grades in school you would have to put your hand up and tell that smart thing to the class/teacher. After couple of years people realize that just having opinion and being vocal about it does not make one a Senior/Manager/Leader. There is much more to it and one learns about it on the job.