I think it's likely that the civilizing effect of literature has done most of the work, and still continues to do. Look at Steven Pinker's book, The Better Angels of Our Nature: Why Violence Has Declined. It proves beyond any shadow of doubt that violence has declined dramatically throughout the centuries. There are various reasons for it: the rise of the state, Leviathan, the monopoly of violence, children's rights, animal rights. They're all positive signs.
Martin AmisLove might have expanded her. But we are not all of us going to get loved. We are not all of us going to get expanded.
Martin AmisWhat did Nabokov and Joyce have in common, apart from the poor teeth and the great prose? Exile, and decades of near pauperism. A compulsive tendency to overtip. An uxoriousness that their wives deservedly inspired. More than that, they both lived their lives 'beautifully'--not in any Jamesian sense (where, besides, ferocious solvency would have been a prerequisite), but in the droll fortitude of their perseverance. They got the work done, with style.
Martin Amis