This & That, Ceci et Cela

Someone remarked that it was amazing to hear how many people think that it is only the wives'/girlfriends' business/problem when a man is cheating on her. I.e. Shouldn't we hold people responsible for their actions because their actions are wrong even when they are hurting someone other than ourselves? And I am always amazed to hear how others want to blur the boundaries between a person's public responsibility and ...