A common question asked in the personal development community: would you rather be right or free? If you're happiness hinges upon winning the argument at all cost, you can quickly find yourself in a shouting match and ultimately miserable, even if you proved your theory about cutting grass was the best one out there!
Those that are truly interested in searching for truth for its own sake must be willing to admit their wrong. But more importantly, they must not bend words and use reason as a weapon. I know some very smart people that use their reasoning skills to control people instead of helping to set people free, providing them the means to improve their life. Admittedly, I probably do the same thing from time to time.
And recent, scientific studies are indicating that this might be a result of human evolution, hard wired into us so we can experience that thrill of victory over others.