With that train of thought you might as well lock yourself in the basement and never have any human contact again. Including TV and radio. You apparently think that everyone must agree or they have lost. Well then I guess the devil has won and you better hide!!!
Disagreement and lively discussion are the key to improvement. If no one ever disagreed or voiced there opinion nothing would ever change and no one would ever learn or grow or move forward. I am of the belief that everyone should voice their opinion and be open to the thoughts of those around you. They may not be 100% right, but you might just see something that you missed in your initial evaluation of the situation that may help you in the future. People for the most part are fairly intelligent if you listen closely!!!