Speak mind or say yes

How many times have we faced with a situation where you were asked to speak your mind but the responses you were getting afterward suggest otherwise. At the end, you felt like you should have said "yes". But then, what's the point of asking? If people can't accept that fact that everyone has their own opinions and we don't always agree with each others but the most important thing is the effort and the compromises we put in to get the work done, how do we really get along with people? Isn't this the fundamental of being a human, to compromise, to discuss the differences, and to agree on something that we feel would have the least unsatisfaction for everyone? We need this at work with co-workers, at home with family, and places with friends and so forth. While you were trying to do just that, what if the receiving end isn't willing to do so? What would you do then? To me, that's a misery that I have yet to solve. Until then, I will just say "yes".