A couple of good questions that have come to my notice recently

In various online forums I've seen the following questions posed recently:

what is the steelman defence of the Christian belief in "turning the other cheek"? or indeed of that same principle when dissociated from Christianity?
is it possible, and if so how, signficantly to increase the economic practicality of single income nuclear families, whether traditional in constitution or otherwise
whether it is sinful or otherwise wrong not to strive for a higher standard of living if one is providing for one's family