Leaders listen to ideas, consider them, and then make their own decisions based on collective experience, knowledge and available information. While you should always be considerate, professional and respectful to your colleagues you should not agree with ideas and courses of action that you don’t believe in.
If your experience, education and knowledge advise you against a particular idea then please speak up and share your reasoning and explain your position. It is essential to build your own credibility and integrity on the foundations of truth and your beliefs. No matter what it is, don’t simply follow the majority and make decisions based on the least amount of friction. Think for yourself and share those thoughts with your colleagues.