Magic the gathering analogy time!

Arguing is like getting to look at the top card of your deck and then put it on the bottom if you wish ("scrying for 1"). When you scry, what you want is to see that the top card of your deck is great and doesn't need to be bottomed. But in that case you gained very little from scrying - the actual value of scrying comes when your top card is terrible, and you need to get rid of it.

Which is to say that you don't want to lose an argument, but that losing and actually changing your mind is a major way of extracting value from them.