U r absolute right. Divorce is good for unhappy marriage based on valid reason. Dirvorce based on adultery is not. How are the adulterous parent going to answer to his/her children? How are the children going to answer their relative/friends about his/her parent extra martial affiars? Commting adultery is a selfish act to fullfil personal excitment and needs at the expense of putting his/her family in a disgrace spot.