I didn’t miss any posts.
If a Rosh Yeshiva doesn’t want his bochrim to go to the stadium, common sense dictates he say that a stadium is an inappropriate place for a yeshiva boy for such and such reasons.
Once the Rosh Yeshiva, Rebbe, or Posek feels that that approach won’t work, he is liable to attempt one or both of the following: Either ridicule the act (hevel) or label it assur al pi halachah by invoking the always available chukos hagoyim argument.
Ridiculing the sport reflects poorly on the Rosh Yeshiva, as it shows how out of touch he really is. The chukos hagoyim argument is a feeble attempt at attaching a prohibition to an innocent act. It can be ripped to shreds by any beginning Talmud student, as has been pointed out by others here.
My point is simple. The Rosh Yeshiva doesn’t want his bochrim going to Yankee Stadium? Then he must present arguments that hold up under scrutiny. After all, his Rabbeim trained the boys to think, didn’t he?