Because ordaining married men if you are not equally ordaining married women to priesthood creates gender apartheid which means all women are voiceless and all men have all sacramental power over all women.  

No optional celibacy until the hateful bias against women being ordained priests and bishops and consecrated Cardinals is abolished and yes that includes women being allowed to be made popes too.   Sometimes the order of how we do things is where the sin and evil are present.  We must demand justice before inconvenience as a matter of ethics and keeping the Great Commandment to love and treat all people the same.