They, are the roshei yeshiva of the yeshiva under discussion. If you disagree with them, go learn in another yeshiva, send your sons to different yeshivos, look for a shidduch for your daughter in other places.
For those who are talmidim of these roshei yeshiva, what I said applies.
When the gemara says “kul ma sheamar baal habayis taase, chutz mi tzei” it didn’t mean, listen to the roshei yeshiva except for their dating policy.