The lack of holidays, celebrations, etc. is to keep focus off of family and is a tactic to keep family bonds from forming. They take away emphasis on family members and place it on themselves. That way our emotions for family are superficial and our tight bond is with the organization. It keeps membership up and dissenters out.
Why would they stand up for the bride? They are a bunch of misogynists! Besides, the bride can't even give herself away - her father gives her to her next owner, the husband. Patriarchy at its best. Evil, vile, disgusting.