You know, I'd consider myself at least not a complete idiot. It's a reasoned move to board out Force of Will against the mirror. Here's why.
Name the card that Force of Will HAS TO stop in the mirror. You know, the card that if it resolves you lose immediately. The only card that I can reasonably think of is Umezawa's Jitte. Jitte is actually pretty easily contained in all of my versions of the deck, between all the tappers and my own Jittes to 187 theirs. With that in mind, why would I want to continually two for one myself over their spells that aren't worth the time?
I've certainly had people board out both Mana Drains and Forces of Will against me, to bring in strong board control elements. I obv died horribly.
I know that it is completely resonable, and also a very strong sideboarding strategy. I just take every chance I get to make fun of kowal.