I beg to differ.
Here is a small part of the letter:
One party in the Ir Hatorah of Lakewood, a party that likely cost around $250,000 (including a full band, massive tent, multiple superstar singers, tons and tons of food, open bars) caused more damage than any possible good. Taaruvos galore, with boys and girls mingling all over the nearby streets.
At a different Shul party, Hatzolah had to be there so many times it is not possible to count. One kid after the next was carried out, as children of all ages managed to get toasted on all types of hard liquor. Of course, the wonderful Baalei Batim of this Shul were writing checks while the 13 year old boys got hammered on as much liquor as they wanted.
Is there nothing intrinsically wrong with endangering kids so that Hatzolah needs to be called multiple times, boys and girls mingling, and little boys getting toasted on all types of hard liquor? I think there is a lot wrong.
I haven't seen anyone defend the party. Only the rabbonim who you are attacking for not having "banned" it. (I put that in quotes because anyone who uses the word banned in relation to rabbonim has an intrinsic misunderstanding of what rabbonim do)
Your premise is that everything an individual does which is disapproved of should be met with a ban. That is the premise which apparently the rabbonim and roshei yeshiva disagree with you about.
A couple of questions for you.
1. were the amount of people needing the care of Hatzolah more, less, or similar to previous years (adjusted for growth)
2. Was the amount of boys and girls mingling more, less, or similar to previous years (adjusted for growth)