Yes, it's reinforced at small scales too. I said usually it's reinforced at most tribally against another group, meaning that this is about the largest scale you can take anger and hatred as a social force. At that point, you're on the edge of war. These kinds of emotions can be very easy to exploit to build a movement, and they scale very quickly, but at some scale, they inevitably sabotage the cause and turn it against itself. Building a movement based on love and empathy does not hit these same limits.