History has proven that many social norms and conventions will reemerge when the time and circumstances are right. ....Correct, the social norms your hero's adhere to were abandoned in Germany decades ago.
Only after tens of thousands of people are killed who would otherwise prevent such an abomination. That's the problem with oppressive religions and social "norms". History is replete with examples of how mankind has fought to remove them, only for the enlightened ones to be murdered in their turn so that the violent, oppressive, scumbag rulers can have their little dictatorships. And the cycle repeats again.
Remember sunni man, it is real easy to rule when you have all of the power and the people are little more than slaves. it is far harder to rule when everyone has a voice.