Even though most tip their hat to the idea of playing nice, so much of human behavior is self-centered. It’s why we say, “It’s a dog-eat-dog world.” “You have to look out for #1.” “Don’t get over it; get even.”
Looking out for myself even at expense of others. Getting even, responding in like kind. Those tend to be the governing principles that guide our personal and business relationships.
And it doesn’t work. Unless, of course, you don’t give a rip about others.