It is hard to tell, as the effects on overall anger levels are not very great. But, it is there.
Lowering ER to 50 (or 80) is actually a bad idea. Lowering it to 51 (or 81) only gives 10 less points, but you get 1 less penalty in reproduction and happiness. Those 10 points are not worth the cost of increasing Reproduction and Happiness to compensate.
[ March 03, 2003, 20:30: Message edited by: Imperator Fyron ]