I have finished reading The Better Angels of Our Nature: Why Violence Has Declined by Steven Pinker and have been recommending it to the few of my friends I think might read it. Pinker convinces me that violence has declined and he convinces me about the reasons it has declined. Neither my view of human nature nor of our future are the same as they were before I read the book.
The two most immediate concepts impacted for me: political correctness and the evolving sense of decency. The evolving sense of decency will take a little more work, so I'll comment on political correctness.
I have for the most part viewed what we call political correctness as an irritating interference with free expression: Who cares if I say "stewardess" or "flight attendant?" (Apparently a lot of people). I heard a slight quibble this weekend over the use of "Comanches" as a sort of a mascot for a professional organization. The organizer who liked the name because it was Texan and Native American argued that the name was being honored and not ridiculed. The politically correct objector said we should not use any racial or ethnic monikers because it promotes stereotyping. I'm not sure who wins this in the long run, but after reading Pinker's book, it occurs to me the advocate of the name may be dating himself (and me, since it sounded fine to me) whereas the PC objector may be right about where we are going in society.
When I was in high school, it was perfectly polite to make fun of homosexuals. I did not hear the word "gay" used in that sense until later. Then, I thought a perfectly good word (Like the Gay Nineties) had been ruined. Much the same about jokes about violence against women. A man would discipline his wife, much in the way of Kate in "The Taming of the Shrew." Cruelty to animals was much more acceptable when I was young, now it leads to Dahmerism.
Now, these things have changed. And violence has also plummeted. Pinker makes a connection. If he is right, good riddance to bad jokes and welcome PC. We can call the group The Fat Old White Men Pretending to be Young and Energetic Like a Band of Plains Indians Warriors.