ZD: “People are assuming that places that would consider hiring a YCT clergyperson would obey the Moetzes after such a decree, which in most if not all circumstances is not the case.”
As Yidden we believe that EVERY SINGLE NEFESH is precious, and likened to an entire world. So even if your point is true, on the off chance that ONE SHUL OF YIDDEN can be saved from straying the Kol Korah was more than worth it.
As the Satmar Rebbe zt”l used to say “men darf tun, nisht auftun”, or since you prefer Hebrew, as the Mishna in Pirkei Avos states ??? ???? ?????? ?????? we show Hashem we tried and don’t worry about completion. Shleimus is Hashem’s domain.
“And if it hurts, one cries out” no Cheshbonos necessary.
Moreover, mussar in general is said not just for the recipient, but so that we ourselves should internalize the message “this is not okay”. ( I think I heard it about protesting against shopkeepers that were mechalell Shabbos here in the US, even though most likely nothing will be accomplished).
And that’s the main reason here: to fortify our Machne and our future generations. By having it in writing as a Kol Korah we strengthen the message for those that do care about Yiddishkeit. “And we choose life”.