It is not always a good idea not to argue, even given all the points that the author has made. If you have a meeting, and someone proposes something: if you don't speak up, it means you agreed to it.

Let's say you're discussing the next release and someone brings up some disastrous idea. You know he won't listen so you decide to keep quiet. The release comes, things blow up as expected.

Don't be surprised if you find your manager at your desk a bit later asking you to work late shifts to fix it. After all you are all in the same team, and you didn't speak up when the plan was discussed.

So in a meeting, speak up and don't give in if you are sure you are right. I have learned this lesson the hard way.